Why are you trying to contribute to Reddit by posting / voting?
To fight disinformation as much as I can. I see it, I downvote it. I see something patently false, I correct it if I'm educated enough on the subject.
I get upvotes, which means people see an agree. Maybe some of them are people who are seeing the info for the first time and I'm helping guide their views in the right direction.
I'm contributing less and less though. I mostly use Reddit for news that doesn't get posted here. Or to read top comments that outline what the news really means and provide deeper context. Because Reddit has more users than Lemmy, you see more of those informative comments. Hopefully Lemmy truly replaces it someday, but we're not all the way there yet. I'm definitely seeing more Lemmy activity than when I joined 1.5 years ago though.
All I can do is outline what I do every day. This same process used to work to create a profile that wasn't banned until I inevitably said some questionable stuff, typically to dipshit Trump supporters. So sometimes these accounts would last months. I think they've made some changes to tighten their grip on new accounts recently cuz I'm getting regularly shadowbanned after somewhere between 24-48 hours. Not temp or perma banned. Shadowbanned. Which you'll know when you try to post and it says "you're doing that too much, try again later", or by going to the 3rd party Reddit Shadowban Tester site, or by just going to the Reddit appeal page and if you can submit an appeal, you've been banned or shadowbanned.
I use Brave browser for Reddit. I know a lot of Lemmy users have problems with it. I don't care. I only use it in Incognito/Private mode.
I go into Brave browser settings and clear all data. All cookies. All of it. Reset it to factory default.
I open Brave back up and open a private window. I create a new throwaway email account on Outlook.
Go to Reddit. Create a new account. I make sure to create a username instead of using one of the auto-generated ones. I avoid words like platform, site, Reddit. I think they might have a method for looking for shit talking names like "Reddit_Sucks" or "This_Platform_Is_Trash". I use a different password every time in case they have a method for banning accounts with passwords that have been used before. That would be dumb though cuz with that many users I'm sure a lot of accounts have the same or very similar passwords.
That's it. I just spend like 3 minutes creating a new account every morning. I comment and get interaction throughout the day. Then the next day, or following day at latest, I discover I'm shadowbanned and start the process over again. I wouldn't bother doing this if I wasn't stuck at work. If I was anywhere else I'd find something better to do with my time than circumvent a trash platform.
I used to use a browser script to automatically re-add all my subs to a new Reddit account, but I had to set the script to only add one every 5 seconds, because if you did less it would detect you were adding too many subs too quickly and assume you're a bot and ban the account. But now, with whatever new methods they're using to shadowban me every day or two, I just gave up on the subs. Too much effort for a day or two. My subs were the only thing that really kept me caring about Reddit. So if they manage to restrict things even further and it gets harder for me to interact on the platform, I think I'll be ready to finally just give it up. Reddit isn't dying anytime soon, but it's definitely on a downward trajectory. It'll go the way of the dinosaur eventually.
Edit: Yeah, there are subs that don't let you contribute if your account is too new, but they're kind of few and far between. Doesn't really affect me that much.