Well I guess I don't have a particular or consistent system but I can find what I need pretty quickly. I have a few tab groups for stuff like youtube, bandcamp which helps a lot, and I use Simple Tab Groups in firefox which has been amazing (but I've only been using one group/window so this is kind of defunct now), but otherwise there are areas of tabs which are related and they are roughly in chronological order. I will manually move tabs so there are areas of certain topics. I know I can scroll all the way to the right for old tabs, and then left of that a specific topic I was learning about at that time, then left of that something roughly related by topic or time, and so on until all the way to the left is the most recent tabs (and then a bunch of pinned tabs that I use very often). It's like a map of time and topic, and not just a bunch of random tabs like you might imagine.
I tried gfx.webrender.layer-compositor on linux and it actually made things a lot worse for me. Youtube took longer to load and sometimes didn't load correctly leading to the page having to be refreshed before it would respond.
The point is that it may look like a mess to you but that doesn't mean it is objectively a mess. Hundreds of open tabs can still have logic and organisation even if that is not obvious to you.
It probably is functionally not too different. I have the bookmark bar open but I mostly have all the sites I regularly go to there. Additionally, I have thousands of bookmarks from many years so wading through them for something I briefly saw and was interested in last week but can't remember enough detail on to find isn't very fun or easy. And where do I look for it? One bookmark could be categorised in many ways so I also have to remember where I saved it. Tags are good but I have too many for that to be very useful or quick.
I do use grouping as well, and I really like it, but this just causes me to have even more tabs because there is less pressure to trim down the endless list since I can hide them.
Of course Reddit is using bots. Every subreddit has an automod which can send replies or messages, and a subreddit level ban message comes through as an automated message. That doesn't negate the fact that they may have thought you were a bot. This isn't some fairness democracy, it is their site and they can run bots and AI, and disallow users from being bots, if they want. That is not an uncommon scenario.
As for your long and original posts, have you never asked chatgpt to compose something? It can be very lengthy and appear original.
Karma farming (which is what you were doing) is strongly disliked at subreddit moderator level and seen as suspicious behaviour at admin level. Both regard it as spam.
That's not how the rules work on Reddit and not really anywhere else either. For example, if you reposted in the context of exposing or harassing then they would see that as brigading. As with free speech, you're not free to do anything you like because you think it is justified.
What you're doing is also an easy easy for bots to gain karma so the accounts can be sold to scammers so they may have thought you were a bot.
Is that a pedestrian crossing they're sitting in the middle of?