I have many missed fast since I started fasting really late in my lifetime. I also didn’t make up fast that I missed during mensuration even after starting to fast.
I want to ask that will my fasts not be accepted until I fulfill all the fasts that I’ve left? Because there are about 200 something fasts and now only a few days are left from Ramadan so what can I do?

Acceptance of your current fast has nothing to do with what you missed of fasting.
Yes, you have to make up for what you missed of fasting, and pay the expiations if your breaking your fast was intentional and sinful.