[Blueface]

Not an expert on this but I believe it is critical to not only look at what you did in the past but also what is it you are doing now.

Reduce your debt to credit ratio.
If you owe over a certain amount of your total credit line, it very negatively impacts you.

Reduce the number of credit cards you have.
Close out as many as you can. The more cards you have, the less credit worthy you are and hence lowers your score.

Pay all your accounts on time, without any exceptions. Don't hit 30, 60, etc, lists.

My son's was a total mess due to stupidity. Took him a while to work on it in the above fashion and recently has just bought his own house, on his own, with no co-signer.

No magical fix overnight. These are the things folks get to sometimes live long enough to regret. You made mistakes, now pay for them slowly, as should be. Otherwise, where would the lesson learned be?
Good luck.