Your strengths
You have a clear opening identity. As White you regularly play the Nimzowitsch-Larsen Attack, and as Black you trust the Modern Defense. That consistency shows: you reach familiar structures and you fight hard in complicated positions. Against runawaychess8 you kept a sharp and balanced game into the late middlegame, and against supcity_69 your counterplay caused real problems for a strong opponent. You clearly have the fighting spirit that bullet chess demands.
Time pressure is costing you wins
Three of your recent losses happened on time rather than on the board. The clearest example is the game against runawaychess8, this game, where you reached move 40 with a rook on the sixth rank and an active queen, but the clock decided the result. The same thing happened against tomayhunt in this game and against supcity_69 in this game.
In time pressure, even five spare seconds can turn a loss into a win. Try a simple bullet routine: play the opening in under two seconds per move, and when your clock drops below five seconds, stop searching for the most beautiful move and choose the most forcing, safe one. If you are clearly better, trade pieces early. A winning position means nothing if the flag falls first.
Protect your king before anything else
Two losses came from king safety breakdowns. Against mirboluki in this game, you castled into a setup where your opponent was already building a queen and bishop attack. When you grabbed a pawn with your queen, your king lost its defender, and the rook sacrifice on the sixth rank opened the h-file for checkmate.
Against bodoy_moves in this game, you actually came out ahead on material, but your king was left without a pawn shield and was hunted down. Make this your rule: whenever you win material, first check your own king. Move it to safety, bring it a pawn cover, or even return the extra piece if that is what stops the attack.
Openings that need a second look
Your results with the Pterodactyl Variation of the Modern Defense have been rough. In the game against supcity_69, the line with an early queen check and then giving up a bishop for a knight left your king exposed and your queen far from home. You picked up two pawns, but White gained a strong center and a promotion threat.
Against 1.e4, try a more solid modern setup with ...d6 and ...Nf6, and delay the aggressive ...Qa5 tries until you have studied the typical attacking plans for White. If you do keep the Pterodactyl, learn the warning signs before the position turns against you.
Next steps
Build a small checklist for your next session. First, keep a time buffer by moving quickly in the opening. Second, before you castle, ask whether your opponent can open files near your new king. Third, after you win material, spend one move on defense. Apply these three habits, and many of those close losses will turn into wins.