@Korniliousim I just messaged you :)
@ThunderClap Honestly, the more I started playing chess, the better I got at it. I also enjoyed watching YouTube, especially Eric Rosen. Learning opening traps from YouTube also helped me get better. I had no idea about how fast I was improving, until I looked at other people's stats and realized that it sometimes took years for them to improve by 100 points (especially from 1900 to 2000).
But, probably the thing that helped me the most was puzzles. During the first months of lichess, I did lots of puzzles, and did around 100-200 each day. Those helped me in every time control. Obviously, learning tactics can help in slower time controls, but it also helped me in faster time controls. I remember a specific ultrabullet game where my opponent played Qf4, offering a trade of Queens, but I played Bh4+!, Removing the defender of the queen and winning it. I only took around 0.5 seconds to find the winning move. Puzzle storm was also very helpful. I used to do around 40 runs of puzzle storm each day, which helped with finding tactics quickly in short time controls.
Oh, and probably one thing that no one does is look at people's best rated wins. When I did that, I looked at how to take advantage of higher rated players that become too comfortable when playing a lower rated player. They often put up a sneaky attack like a Greek Gift or something like that. That helped me get my best rated bullet win, where I put my queen on the and his queen was on b3, but he didn't notice the queen was hanging, and he hung the queen, allowing me to take a free Queen.
Finally, I watched players play games. My favourite rapid and classical player is GM (@) akitalover. Akitalover is a very positional player, while I always get bored of positional play (haha, but I'm learning from it). Akitalover takes place in the rapid and classical shield tournaments, and when he does, I watch his games and learn about positional play.
Hopefully I can get as good as you, (@) thunderclap, and we can meet each other in an OTB tournament!