2 years is usually where it's done but I've definitely heard of people who have growth spurts later on! My changes always came in waves, never steadily, and even being about 3.5 years now, I get weird spikes in things like sex drive and I've even had some voice changes again recently (granted, small ones for the voice). The 2 year rule for most changes (except hair and fat) is a generalization, and the probability of getting more after that is low, but not 0. You're probably one of the exceptions!
It may also be related to your lowering dose. One of my spikes in sex drive definitely correlated to a lowered dose, probably because my T was converting and the lower dose also meant lower estrogen for the T to battle. If your T is too high, a lowered dose actually would likely yield more changes. It's less about having a lot of T and more about how high your T is compared to your Estrogen.