The day you stop letting a past failure veto new tries is the day your life gets bigger.

One bad experience can quietly acquire the power to rule on everything that resembles it. You did not decide to hand it that authority, and it acts as though one result settled the matter permanently, which it never does. The cost is invisible, since it is made of all the things you did not attempt.

Name one thing you have stopped trying because of how it went before, and ask what has changed since, starting with you. Then do a small version of it this month rather than the full version. If it goes badly again, that is one more data point and not a sentence.