Review every game. In this game you couldhave won his queen early and make your life way easier, avoiding time pressure. With playing more, you will improve and see such things.
You thought 1 minute about castling. Why??
Then a5 instead of the logical a6, blundering the bishop in a great position.
You have to be able to avoid that kind of stuff basically "without thinking" - which can only wok after you trained a lot and know how to handle basic positions.
Can someone tell me how to get better at playing moves faster? even in a 15|10 format I often end up with under a minute left and have to try to move fast, the time pressure often leads to me blundering and losing , even when my position is better. Take this game for example where I got low on time, made some bad moves from pressure and lost.