I got banned and any new account I try to make gets shadow-banned. As far as I can tell, my offense was calling Elon Musk a Nazi when he did his Nazi salute during the inauguration. A mod warned me to not call him a Nazi because the ADL said it wasn't a Nazi salute. Then a few days later he gave a speech for AfD in Germany and I commented "Still think he's not a Nazi?" Next thing I know, I was banned forever.
Stop signing up with the same email address and you won't get shadow banned. Your email address is literally the only way they track you. Once I realized this, any new accounts I made with a fake email work just fine.
I've never used the same email account. I go to one of those websites that let you create a temporary email address and use that whenever I sign up for a new account. Not just for Reddit, but for most sites. I was very annoyed Lemmy wouldn't let me create an account with a temp email address.
After I found out I've been shadow banned I got a new browser (Brave) and only access Reddit via incognito mode on Brave. When I first got Brave I created a new account and have never logged into an older account through Brave. I also have never logged into an account I created on Brave in any other browser or device. The only thing I can think of is ISP address?