Is there a way to clean my list?

I imported my old list that I have not used in mailchimp and I got en email they will not send it because of high bounce back rate etc… so I might loose thousands of emails I collected for 10 years.
If I go to AES will they do the same and ban me for life? I already have mautic installed but my host is giving me max 2400 per day to send out…so it sucks…
I am afraid amazon might permanently ban me or something
How to clean the list for free?

I use Email Oversight or Zerobounce to do so.
You can even automate it: