Sadly though indie webcomics aren’t that popular in comparison to Japanese manga. That’s my opinion as to why the community seems quiet.
You might be too young? When i was posting i could do a horrible drawing of one of my ocs goofing off. And like actually get comments or peopel would favorite it in a funny file.
Or we would talk about how their oc would react to seeing my oc. It was fun. Less pressure to care about views and followers cause it was just fun.
I..... don't actually know what Paint Berri is? I know there are other art sites out there, but I haven't heard of any of them getting a lot of traction, so I haven't really gone looking.
I think a nice community can still be found/built, just maybe not on deviantArt. This website was great and I met some amazing people there, but nowadays it's seems to be very empty.
Instagram is quite an okay place to meet other artists (I say 'quite okay' because I tend to forget about this app so my activity there is not as should be to form valid opinions). I met some art friends there, we comment on each others arts and share them in stories. I've also seen people hosting events together, and even creating discord servers once they have a group of people they constantly talk with. Events like draw this in your style, artists support, or monthly challenges might be nice opportunities to make friends. And also, commenting on other people's arts ( :
As for discord, I can't really say anything about it, as while I have two small but super supportive discord groups, they are both formed with friends I met on deviantArt (and most of them left dA already).
Its like tegakie was. You can upload a draw and people can draw back instead of write back.
Heres a link-
https://paintberri.com/posts/browse6
....
....
hides under desk because she has no idea what that is, either
I've been on Deviantart and Tumblr basically forever, but otherwise, my art's been on various forums for whatever I was interested in (if I was making art about a fandom, I usually had an art thread on a fandom forum), and I got on Instagram like 2 years ago?
I'm not on Twitter (technically...), or Reddit, I'm scared to death of Artstation -- those people are a level of good that I can't wrap my brain around, and I feel like a grubby urchin just visiting that site-- I won't do any platform that's video based (YouTube, Tik Tok, etc), and I will BITE you if you try to make me go back to Facebook. (hissssss)
But otherwise, I'm barely aware of other platforms. I think I know Pillowfort is a thing? Heard about it once? Never really checked it out.
hahaha. no, i am not too young. I joined deviant art in.. 2007? before that i posted in elfwood, like, 1997. I guess I never got in to OC's. Mainly just random fan-art and comics. Anytime I posted some art of my own, it got 0 attention. Just like now on deviant art! hahaha.. So I guess No surprise I haven't noticed it changing.
It's nice you found that. it sounds like fun. Too bad you can't find something similar.
May I suggest trying out twitch? Streaming and hanging out in other artists streams have been a great way to chill and talk about art for me. You could try finding some smaller art streamers(can be hard to keep up in larger streams) and see if you like them and if they seem open to talk with you. You could also try streaming yourself and see if you like it! There are also some pure art dedicated stream sites like Picarto, which also could be an option to try out.
yeah. I leave artstation to the working illustrators and character designers... It feels more like a site where your art portfolio lives anyway.
I joined pillow fort last year. It was pretty dead. Honestly haven't tried much lately. Maybe its better now? i dunno. just reminds me of tumblr, but not as popular
I found all of those things you listed here. In the Sketch a day thread and the RP thread I'm currently a part of (especially the latter). 
thanks
@Brumoss @Scarlet_Cryptid
I sorta run a very small discord group, it's super lowkey and we all just kinda hang out or show off our stuff? If either of you (or anyone who manages to read this message lol) are interested in checking it out, feel free to DM me and I can send y'all links? And like no pressure to stick around either, it's not SUPER active but we all try our best to talk to each other when we can lol
I have spent the roughly past decade lamenting this exact thing, the homogeneity/hostility of social media sites towards artists, the HUSTLE, etc etc.
buzzly.art popped up around the end of last year, and it's similar to pre-2010 dA. I've managed to make a few solid friends there, even. Would recommend giving it a shot, if nothing else than for how active it is and to have a concrete gallery.
I just tried to make a buzzly and it said it wasnt accepting new members but thanks, it looks cool, and ill keep trying!
And i feel that so hard! Like i use to not care about the numbers but the lonelier i get the more im starting.
When i find myself caring too much about the numbers i take a break and work on a art project for just me that i don't plan to post.
Its not deviant art, this also happened to me that when ur art is worse people tend to react and draw ur oc's and stuff do boost your confidence,
I like the features DeviantArt has. It was an art site first and foremost but had a lot of social community features like public chat, forums, groups that make it feel like there was a lot of avenues to connect with others and also promote art.
Nowadays when you post artwork on sites like Instagram and Twitter you gotta hope people spot it in the tags and also spam the link all over Discord and maybe Reddit in the channels full of other link spams and hope some people see it and are interested. It honestly feels helpless sometimes.