What should I do?

I have 12 old medical debts on my credit report - some fall off in 2015, some in 2017, one in 2018. My ex is supposed to share the cost here, but never does (sorry – had to explain why I let these go). I have an old car loan marked "paid in full, was a charge off" (I settled with them) which falls off in 2 months. In 2011 a bankruptcy fell off my credit report.

Currently, I have a car loan and two low balance credit cards which I’ve strived to pay on time for the past 2 years, but truthfully I was 30 days late (only 1 time) on each a year ago when I ran into some financial difficulties. 2 years ago when I ran into some difficulties one of the credit cards tacked on so many late fees & over the limit fees that I now owe them about $200 over what the balance due is and they closed the account, however, since then I pay them on time and they show “Pays as agreed”. I was hoping that by a good payment history on these debt for the past year would increase my credit score, but no such luck. It’s sits at 530 still.

My questions are:
1. Will my score improve when the car loan falls off in 2 months?
2. Would paying the credit card that was closed off, so it shows it’s paid in full, increase my score? I know and understand this will remain on my credit report regardless.
3. Would paying off the medical debts so they are shown as paid in full increase my score? Again – I know these stay on my credit report regardless of being paid off.
Thanks.