Turn over a new leaf
Adam ruined his health. So he decided turn over a new leaf and give up smoking, alcohol and drugs
Matt realized he was not being a good husband, so he turned over a new leaf and did some more chores around the house
Gavin was stuck in a rut, so he turned over a new leaf by volunteering at charities.
Definition: making a new start. It is often used specifically to describe changes in personal behavior that are made with the goal of being a better person.
Etymology: dates to the 1500s. The implication is that one is turning over the previous page with the bad behavior, and starting anew on a fresh page.
Clean Slate
Although Henry made an error at work, his boss said that the matter was over and he could start a clean slate.
After Jamie reunited with his girlfriend he hoped they could start on a clean slate
In order to start a clean slate, Greg left America to work in Australia.
Definition: start completely over with nothing bad in your past taken into account.
Etymology: This expression alludes to the slate boards on which school work or tavern bills were recorded in easily wiped-off chalk. Since 1850 or so the term has been used figuratively, and it has long outlived the practice of writing on slate.
Making bank
After getting the job at the audit firm, Fiona started to make bank
Jeffrey was making bank after getting promoted
Jonathon was making bank this Chinese New Year by getting red packets
Definition: acquiring significant amount of money in a short period