Here’s a blog about the “arrival fallacy” the idea that we will be happy once we reach our goals:

https://advice.theshineapp.com/articles/are-you-leaving-your-happiness-up-to-the-arrival-fallacy/

As the post points out, you are going to be the same person you were before you reached your goals so rather than being so focused on reaching your goals, focus more on who you are.