Can you check grammar on this letter please?

To whom it may concern,

I am writing to appeal my insurance that's going to be cut off next year. I am worried of my insurance being dropped, as I mistakenly discontinued it. I am still hoping that you can reinstate my insurance for next year.

I decided to cut it, because I thought Medicare was really intended for elderlies like me, but having no prior knowledge about the program, I still decided to cut Health net just to be on Medicare. After a month, I went to my doctor and she explained about Medicare. I felt surprised and upset, as I just removed my insurance, moreover missed the deadline to renew my insurance. I admit my mistake of not taking necessary precautions of my actions. I have been on Health net for years and I am very much satisfied with the plans and services that I have. I am asking this because I can’t afford losing my insurance at his age.

Please understand that I thought Medicare would be beneficial for me, but I realized that the drawbacks outweigh the benefits. I hope you can give me a second chance, and thank you for considering this appeal.

Sincerely,

I am weak at writing, anyways I feel like I made lots of errors. Pease feel free to check, and if you want to rewrite it, that'd be awesome. its for my mom. thanks :)