Change your ways
Definition 1 of 1
Pro Tip 1/3Positive Change
Used when suggesting improvements in behavior or attitudes. 
He realized to gain her trust back, he had to change his ways.
Pro Tip 2/3Reflects Seriousness
Indicates a significant shift, not just minor adjustments. 
After the health scare, she knew it was time to change her ways.
Pro Tip 3/3Personal Effort
Implies that a person must make an effort and decide to change. 
He promised to change his ways and treat everyone with respect.