turn over a new leaf in English:

1. make a new start

English word "turn over a new leaf"(make a new start) occurs in sets:

idioms/ fixed phrases 4
CPE idioms and fixed phrases
Fiszki evans

2. to start behaving in a better way

English word "turn over a new leaf"(to start behaving in a better way) occurs in sets:

Masterclass proficiency unit 2 page 24-30, 32, 36-37
Idioms database