If you really want to know, it's because you're asking how to bypass security and get back on a website that a lot of us have walked away from.
Also, I assume there was a reason you got banned, and considering all the assholes that they let run rampant, it must have been pretty bad to get permabanned from the whole site.
Now, I don't know you, or what the situation is, and you could be the exception to every rule, but, when I see your post title, I assume that you bring toxicity to the party. We don't want it here, and we don't want to help you bring it back to Reddit either.
Like I said, I don't know you, so maybe none of that's true, but that's one reason why you're getting downvotes.
Not sure permaban always have to do with something severe that you did, I got banned from a subreddit and after a month I asked the mods of the specific sub to let me back in, meanwhile the only thing I did is to comment to this sub with another connected account that I had, the mods all they did is to report me for no reason and reddit mods permabanned both my accounts, I never said anything bad or inappropriate, the site stinks real bad it's simple as that
Eh, you can, but they'll eventually catch on if you do anything much other than passively scroll.
You can try getting in via a VPN, but you end up with the ip addresses of those getting obvious after a while, which sometimes means they very banned as a block.
Since you said you want to go back for contact with a group of friends, if you do get back, don't do anything other than contact them to arrange other means of interaction.