It seems I have been adjusted upwards like 40 times in the last couple years, I'm pretty confused about this because the only scores I ever posted were trash farm maps and that was all years ago; I'm a washed player at this point. Why am I being rewarded? Is this just a clearing of people that haven't been online in 2 years or something?

There's been two recent reworks in the game. The big boost in rank comes from the removal of inactive s in the game (I think it's 6+ months of inactivity)

home/news/2025-03-06-performance-points-star-rating-updates

Periodically, inactive s will be removed from the leaderboard, and changes will be made to the way scores are calculated, causing ranks to fluctuate from time to time. You can read more about it on the wiki page the above me linked!