General advice/statement dates/CLI

I’m not new to credit but I am new to credit. I have a 3 year and 3 month account age, 4 cards. Discover IT student I got 3 years ago, Apple Card that I got roughly 2 years ago Cap1 platinum I got mid February 2026 and Chase freedom unlimited I just got (march 2026).

The first year was fine, but then things happened, I was stupid and maxed out Apple Card and discover, missed payments (Credit Karma says my payments are 91%). At the start of this year I paid everything off and now only use one card at a time, keeping it under 30% for the card and under 10% for my credit limit (5,500 total).

I’d like some tips on how best to recover my credit. My score currently is from 617-672, FICO shows 617 and TransUnion shows 672, same with equifax and experian. I am also trying to figure out what the statement dates are for these cards, I know discover for me is 27th of the month, for the other cards I’m not sure.

My goal is to increase my credit limits, credit score and to eventually get a new card in 6 months and by next year (2027) get an AMEX gold.