What You're Doing Well
Your recent wins show strong endgame skill and patience. In the game against speediie, you promoted two pawns and delivered checkmate. That kind of persistence is valuable in bullet. Review this to appreciate your technique.
You also handled a messy middlegame well against treeutomo123, winning material and forcing your opponent to run out of time. Your ability to keep pressure in balanced positions is a real strength. See this for that performance.
Specifically, your use of the fianchetto setup as White gives you flexible development and safe king positions. Keep playing openings you understand.
Time Management in Winning Positions
Your biggest issue in the losses is the clock. In the game against ftu-fnb8-vohoanglong, you reached a winning rook versus bishop endgame, but you lost on time. In bullet with no increment, every move counts.
When you have a winning or drawn endgame, try to play faster and simpler. Avoid deep calculation when a natural move keeps your advantage. Use your opponent's time pressure to your advantage, and consider premoving obvious replies.
Review this to see where you spent extra seconds.
Tactical Awareness
In the game against Oleg Gamayev, you resigned after your opponent's queen moved to a4. That move attacked your rook on e8 and a pawn at the same time. This is a classic example of a Loose left unprotected.
Before you move a piece, check whether your opponent can attack it with a queen or rook on an open diagonal or file. In that game, your bishop move to b7 left the rook on e8 exposed. A quick scan for queen attacks would have saved the game.
Look at this and notice the moment your rook became vulnerable.
King Safety
Against wayfinderz, you were checkmated after pushing your g-pawn from g6 to g5. That move opened your king's shield and allowed a decisive attack. In bullet, it is tempting to create counterplay, but you must first check whether your own king becomes exposed.
Remember that moving pawns in front of your castled king is a serious commitment. Look for safer ways to fight for space, such as piece play or central breaks. Your king should come before pawn advances on the side where your king lives.
Study this to see how the attack developed after that pawn move.
Final Thoughts
You are clearly a strong bullet player with good endgame instincts. Focus on three things: spend less time in winning positions, scan for loose pieces before every move, and respect king safety. If you tighten these areas, your results will improve even more.