When do you stop tweaking your app design and finally launch it to the public?

It's way too easy to get stuck in an endless loop of polishing your product because perfection feels safe. You keep telling yourself that the next UI update or feature tweak is what's going to make the difference, while the actual core problem sits untouched. I delayed a simple launch for a month just because I wanted the onboarding screens to look like a big tech company's. How do you force yourself to ship the messy version instead of waiting for it to be completely spotless?