Only looked at the game you lost. You played Qg6 without looking for immediate forcing moves (checks/captures/threats) your opponent could play in response.
This is really going to be the biggest thing that will hold you back from getting stronger so work on changing your thought process to "look for my opponent's forcing responses before I actually play my selected move".
When it comes to stronger players consistently beating weaker ones, this one behavior is always seen. They don't often get surprised by a sudden check/capture because their brain is programmed to see those moves each and every time.
My former coach would refuse to look at the rest of the game when I did this and even though I wanted to him to see that super cool tactic at the end, he would simply say "learn to crawl before you want me to critique your walking" :)
Not saying I practice what I'm preaching a 100% of the time either, but I've been doing it (i.e. making sure I can deal with his forcing moves on EACH move) more and it has improved my game considerably.
These are several games I've played recently. In two of them I beat a player ranked quite a way above me. In the other I lost to a similarly rated player despite being in a good position. I'm wandering if you have any advice on how to improve consistency or is it just keep playing and it will come.
Any analysis of the individual games is welcome too :)
(In the first game I'm white and next two I am black)