Weird how 2200-2350 seems to be where a lot of people who improve quickly hit a wall.
I think your range is off by around 50-100 points (I think stagnating at 2250-2450 is more common), but yeah, I don't know what it is about this range that is just so difficult to get over. Perhaps it's because that's the level at which you start to see masters, who have already done loads of studying for OTB and thus have an inherent edge over people like me who never studied? I think that should be it. Players chasing the master and/or FIDE titles have much larger of an incentive (which at this point is even partially financial) to improve their chess skill than players of any other rating (discounting higher ratings), so this explanation appears to make sense.
I’ve been playing for around 2 years, but plateaued at around 1900ish after like a year and continued getting stuck at the next 100 barrier. It’s much tougher to get to titled player level rating otb rather than online, because otb is harder than online. Keep playing otb, and try to focus on that as online ratings don’t matter as much as otb ratings.