Can relate. I struggled with perfectionism for a very long time. I still struggle to this day, I tend to be overly critical of my art to the point that sometimes I even lack the courage to post promo pics on my social media.
BUT!
I've also been posting my comic for 3 years at this point, so hopefully I can share some of the things that worked for me
"Done is better than perfect"
This was the quote that literally changed everything for me. I'd been working on the script for The Emergency Coven since 2015 and posting it as a sims story on Tumblr, but I was too scared to turn it into a comic with actual drawings because I felt like I was not "good enough". I found the courage to start working on page one only in 2017 and got stuck there for the following three years. Three. Years. Then I stumbled upon this Youtube video talking about perfectionism and how it hurts us, and that's where I heard the quote "done is better than perfect". It made me realize that sitting on my project for so long wasn't doing it any good. What even WAS the point of taking ages to do a single "perfect" page if the story as a whole was never going to see the light of the day? So I realized that it'd be better to worry less about making it "perfect" and focus more on getting it "done".
Time limit
Another thing I do is kind of... have a limit on how much time I spend on my pages. I work in Procreate, so I can easily see how many hours of work it takes me to make a page. Typically it's 7-8 hours of work for the average page, 12-14 hours of work for complex pages with lots of backgrounds or difficult perspectives. I try to never go over that limit. If I start to notice that I'm getting close to the "time limit" and still obsessing over fixing tiny details... I call it a day. I stop trying to fix the thing and just try to finish the page. Maybe I let it sit in my comic folder for a few days and THEN add some quick fixes in Photoshop, but other than that... I let it go.
Use shortcuts
3D models, stock photos, selfies, Body-kun/mannequins/dolls, mirrors, copy-pasting faces and backgrounds from already drawn pages... as long as you're not stealing somebody else's art, there's no shame in using shortcuts. Artists do it all the time!
Find a compromise
I wasn't feeling very confident with digital art when I first started to make my comic. So I made it a mix of traditional and digital instead. Then, as I started to learn more tricks in Procreate, I started to work entirely in digital. My original shading style involved a lot of painterly rendering and, although I loved it, it was very time consuming and was also starting to hurt my wrist. Comics are very time consuming and you're going to spend A LOT of time drawing pages. So making sure you have a style you can easily work with is key!
Preparations
Already mentioned by @darthmongoose, but yep, this is an extremely important thing. The key reason why I can keep up with my schedule while also having a full time job is because I had a LOT of preparation work done before. Namely:
-I have a summary of the whole story from start to finish;
-I have a good half of the script already written;
-I carefully plan my layout and scenes using 3D models and photos, so I know exactly where each character goes and where each balloon goes before I even put my pen on my tablet.
For me personally, having a good part of the script already written helped immensely, because in this way I don't need to stress over writing AND drawing at the same time! I know some comic artists can just do with a summary and then write the script as they go, and that's fine! It all depends on what works best for you, really
but yep, preparation (including stuff like saving your palettes, Photoshop actions and so on and so forth) can make things a lot easier!