Yeah. I've done this quite often, and something I've learned the hard way is that you can do more than one, for sure, but you gotta balance it so that one of your projects is always your priority. So one can be a side gig, or a short gig, or just a funsies gig--but make sure that it's always clear to your readers and to you which project takes priority. If stuff falls out, which project will take a backseat. If you need to drop something and stop updating altogether--which project will get dropped. Overall,
So for me, my webcomic is my backseat lower priority as I do paying artwork during a stressful pandemic time. But, I still work on it, despite the fact I had to stop updating every week. Which is fine. It's not my paying top priority. It takes a LOT of stress off of yourself to only allow one thing you do be the one that takes 80% of your attention.
And that thing can change! At one point I was designing and selling lasercut buttons, till I lost interest. At another point I was a youtube crafter, until I lost interest in that--basically you should do multiple things, or you'd never know--but if you have too many things, you'll drop em all, so I'd be aware of your own limits so you're not too little butter scraped on too much bread.
Now if it weren't a Covid time as it is now, and if I were back to my old productivity, I usually assign a schedule to my side projects, because otherwise I will forget to do them, but I make sure it's suuuper lax. That way I can make a buffer and take advantage of scheduled posts (at one point my webcomic had 1 years worth of buffer and lolololol it's all gone). I rely on queue scheduling so much to free my brain that I...just can't really do webtoons because they don't have scheduling right now (I even schedule my tweets with tweetdeck. I highly recommend automated scheduling, especially if you decide to juggle twitter accounts.)
Just be aware that you're only human, and so you will need to write down and plan which days you work on what--I tend to use Asana for that--but right now with the Covid, again, my productivity is down so I'm just...letting go of all that. And that's OK.
But another thing--and this is just a Tapas thing--I have noticed most of my readers to my side stuff were people already reading my main stuff. I don't really get new readers from posting different things! Which is odd, but youknow...I guess it's nice they like my other work.