It's honestly not as hard as it seems if you look at tagging as a way of labeling or categorizing
this post covers it briefly along with some other stuff but ideally if it's a fanwork post then you're probably gonna tag it as is related. So when i do something for say Sonic then I'll tag like "my art, fanart, sonic fanart, sonic the hedgehog, [the names character(s) included]" and then medium like digital or traditional art or writing and sometimes software (like i'll tag medibang or medibang paint to find fellow users)
When it comes to original stuff i try to keep tags sorted so they include the story the oc is from if they have one or character design if it's just a one off, names of characters included in the posts and then other relevant tags for original content
I've also made a tag for my own art (vi's art) so that i can use the "/tagged/(insert tag)" bit of the url to create a page just for my stuff on my blog but if anyone wants to find my stuff they can also search it on tumblr and it should come up (tho other vi's do pop up as well)
Another thing too understanding that sometimes you just gotta hunt folks down (not in a creepy sense) but like find those circles so if you do enough digging in tags related to original characters you can find some good pages with stuff like oc prompts or oc shares and things of that nature (it's something i'm still working on but i know there's value to it plus i want more oc prompts to use as inspo and to chat with fellow blorb makers)
also not every "bot" page is a bot but like gimmick pages (tho the porn bots are definitely a thing that exist and drive me nuts) but like sonic approves or ___ heritage posts and so on are stuff you'll see so even if you're thinking "oh well just this one random thing liked my stuff" it could very well be people you just gotta check the page
also looping back to tags specifically some folks kinda ramble in em similar to how folks used to use tags here on tapas as a secondary description box for stuff that wouldn't fit or wasn't super relevant to the page. But they're also useful in reblogs coz while some folks do reply directly to posts no one really comments directly on a thread to go "lol same" coz that stuff is for the tags so getting comfy with using em (and heck reading em too coz i've gotten some sweet comments there) helps
That's like in terms of using tumblr in a more general sense I've purposefully relegated different tasks or interests to different blogs so my main (vibrantfoxart) is mostly for me posting my art and the occasional reblog of something that needs boosting from elsewhere or to share info (like i've been trying to share helpful how to use tumblr ones ppl are posting as more folks migrate) meanwhile my secondaries are for sharing stuff that's not mine so one for general reblogs, one specifically for sonic stuff, another for splatoon and then going back to original content i've got one for oc lore dumps for the ppl who wanna read it while also keeping my main page clean and then an comic/ask blog i'm trying to revive