Used to = past habit or state that no longer continues:
“I used to play football.”
“She used to live in Spain.”

Would = repeated past action (NOT states):
“Every summer, we would travel to the coast.”

Practice:
1. I ___ (play) the piano when I was young.
2. We ___ (visit) my cousins every year.
3. She ___ (be) shy, but now she is confident.