I think it helps to learn to be forgiving of yourself for not being perfect yet. Especially if it's something you've only done a few times before, or if you're younger and you don't have too much experience yet. Like it's easy to forgive someone else and see the good stuff in their work, it's harder to do it to yourself.
Sometimes you have to step back and say "I have to post it now or I'll never post it." Like every page of every comic I've ever posted is covered in issues, but they take so long to make, that if I don't do it, it'll never happen. So, I work to a point, and just keep going to a different page, saying "I'll fix it later" but 9 times out of 10 I won't fix the issues becuase weeks later when it's time to post the thing I look back at it and I'll realize "this is good enough to go."
Like you have to humble yourself and say "this is who I am, these are my flaws, and I have to let everyone else see it" and that can be really hard to do.
Because art is a lot like music where if you practice alone and no one can hear you, you cannot improve as much as when you perform and get ready for a performance. In art you can study alone for a long time but you gotta post in order to see the improvements that you really want to see in a quicker amount of time, so I see it as a sacrifice--I humble myself and take the L if I screwed up a page or made a mess--but I don't usaully regret even the pages that were hard to read or not as nice. Because, in the end, it made a performance that other people could enjoy, even if it had some rough edges. And I learned a lot, and I got better, so it helped me feel more positive about my abilities as a comic artist.