As someone who works on multiple comics at once, every comic I've worked on has "down" moments and then "up" moments, and the thing that helps me, even more than breaks (breaks are good, esp when you're using those breaks to creatively recharge) is just having a plan.
If you've got your script in order, your thumbnails in order, and you've maybe even got your sketches, the rest is just execution. This has helped me more times than I can count. There's been plenty of time where I'm tired, but a comic page is due, but like, HEY, I already did the thumbnail or the sketch, all I gotta do is get that to a completed stage and boom, I'm good.
Consider also having a scheduale or planner! (I work out of a planner every day and I swear by it, aha) Knowing how much you need to get done in a month and then getting that goal, and nothing more. So, for example, you need to do 3 updates in a month, that means you've got time where you can either get it all done early in the month (then the rest of the month is free) or spread it out through the month. But, as long as you hit that 3 month goal, you're good.
I spend that time just zoning out and inking/coloring/shading listening to video essays, podcasts, tv shows, or talking to a friend over mic. Comics just has these like, moments of you don't need to be putting your whole brain into it (at least, that's how it is for me) that are good to co-exist with other fun activities.
Er, and one of the most serious pieces of advice I give folks is just to get therapy. I've known and seen many folks who, well, they started liking art again once their mental state was in order. I'm not assuming anything, I just think this is important advice for anyone reading this to consider. (And keep in mind that student counselors are at most doctor's office and can see you FOR FREE. I've had a lot of luck with them!)
You could also consider asking someone for help completing pages. If you know someone who is willing to lay down flats or do shades, that can help a comic get done a lot faster. It's a long shot, but it's something and I know there's folks looking to build their portfolio.
I think jumping ship entirely is not always the answer, since I've seen many folks jump ship every time and never complete any comic. It's a very common problem to have, so if you're finding yourself wanting to do that-- it could be time for edits. (Harsh, but true.) It's better to have a shorter, completed comic, than it is to have an incomplete one forever; at least that's what I think as someone who has completed quite a few comics.
Good luck buddy, love your comic and I'm rooting for you. You can do this!