i haven't fully dived into it, mostly just observing and also giving my hands a rest, BUT i've noticed a useful way to keep up is watching out for sounds or trends that go viral that are easy to plug your ocs into.
like one big art trend for a bit was the "erasing the sketch to get a finished artwork" thing. nowadays it's stuff that might take a bit more effort (mostly simple editing) but if done well enough can grab folks attention really easily
another thing is feel free to grab the anime fans with sounds or edits related to certain fandoms (if your interested in them at least) the "ganbare ganbare" one with audio from nagatoro and jjk was good for that
i think he only other tips on what to do is going for popular tags so aside from stuff like "fyp" or "foryoupage" things like "artistontiktok" or "artisttok" or even stuff like "animeartist", "comicartist" or something similar just to get you into the right circles
and going back to sounds there's like a big chunk that are just intros for you the artist/writer or to show of your work so mixing those in with trending music sounds is a great way to slip into some of the niche corners of tiktok and spread more easily. even those "every friend group has" sound are useful because you can plug in which ocs fit into those labels.
if you really wanna hit something that's still got steady momentum right now i'm pretty sure the adult swim bumper meme is still going strong so some aesthetic music and your choice of artwork + the proper gimmick is 100% an available option
when/if ever i get around to actually uploading more stuff i'm hoping to post a mix of original content with ocs and comic art and then tossing in the occasional fanart. in the long run i might give simple animations a shot alongside little gifs or speedpaints set to some of the indie music stuff on tiktok
my link is here tho the only thing up is my one joke/meme upload
https://www.tiktok.com/@vibrantfoxart