My Credit Card/Savings Trick… sucks?

22M and I currently have an AMEX Green & Marriott Bonvoy Boundless Card.

I currently have a strategy in which I have my auto payments hit right after my interest settles from the month on my OpenBank Savings account which offers me a 4.22% interest.

I do not use my checking what so ever. All income goes towards savings. All purchases are done with credit and that money is pulled from savings.

Is there a better way to do this? I’m trying to milk it for everything I can get. Would appreciate the advice!

EDIT: idc abt the timing of my payments or abt my credit cards. I’m simply interested in seeing if there’s a better strategy in order to increase my return. ex. money market?