If every account is getting banned then I'd stop creating new ones for a bit and try to figure out why. Buying accounts is already a red flag on many platforms and if Reddit linked those accounts to policy violations it can affect future accounts too.
Also keep in mind that it might not be fingerprints at all. New accounts often get caught by automated systems because of IP reputation, account behavior, posting patterns, or activity that looks unusual for a brand new user.
If your goal is to use Reddit long term I'd focus on a normal account with a verified email, participate in a few communities you genuinely care about, and avoid any promotion for a while. Constantly creating replacement accounts usually makes the problem worse rather than better.