Have your ISP cycle/release->renew your IP address. Don’t attempt to sign in to any of the previous accounts from the new IP. Should avoid their anti evil team’s tooling as long as you’re not causing trouble.
That's a whole other can of worms. I assumed that and asked ATT to do so and got the phone support equivalent of blank stares. I miss the old cable modem days where you could change the MAC address of the primary device attached to the ethernet port and force a new IP but not so with this Fiber ONT they gave me.
VPN. I've been pleased with Mullvad.
Except it pushes the problem onto someone else :). Though yeah I'd probably do it too in the end. Not everyone uses Reddit anyway
This but also don't use any email previously associated with any account cause they will go and blacklist your new IP too.
Better yet, don't give them an email address at all. The UI would make most people think it's required, but it can be left blank. It will nag you for a while to add one too, but that banner can be removed with uBO.
Or just login to Reddit from as many possible public locations as you can, infecting their IPs also.