hmm... its really hard, bc you essentially need to find the equilibrium between unsunstainable perfectionism and sloppiness. you need to find the place where you can say 'fuck it, thatll do.' and then, when you find that place, you need to go produce the rest of the comic without descending into apathy haha.
an important thing to remember is that whatever you produce, it will never be whats in your head, and you will never be satisfied. therell be a lot of things you could do better that youll only see when youre finished. but ALSO!!! whatever you produce, you have made an achievement and made progress, because youve produced something. if you keep editing and redrafting something ad nauseum, you arent producing anything, and what can feel like improvement is stagnation. whatever you dont like about this comic, you just take that learning moment to the next project.
i stop myself from doing drastic rewrites or redraws by A: having absolute deadlines and B: being lazy. if ive got all the inks done on a page, like fuck am i redrafting it now, even if i can see AAAALL the flaws and its making me mad. ive made my bed, i'll lie in it. by setting absolute deadlines (and internal deadlines!) you have to force yourself to move on, and its good practice for the industry. the only way i can stop myself from sinking into a black hole of doubt is to divide my time into research phase / development phase / drafting phase / production phase - no matter where im at, when those deadlines hit i MUST move on. sure, if i gave myself a year for research on this 20 page oneshot it could consume aaaaaaaall the content even vaguely related to that genre and fill it with a THOUSAND obscure references and have my thematic symbolism on POINT, but more likely id just never climb out of that research hole. learn to recognise when youve got enough to move forward, even if you havent got 100%
i also find it heartening to go watch a really popular or acclaimed movie and pick out the flaws. its the only way i got through detective pikachu. if you can see the writing flaws in something everyone around you is loving, youll realise that every piece of art is flawed, but can still have a heart that brings joy to people - and most people will not notice.