Practicing tactics, going through a lot of puzzles will get you far. It will basically reduce everything you're complaining about except for 2).
Pawn play can be tricky even at higher levels. Looking over some common pawn structures and their motives could help you. I don't know how advanced that is for your level but at the most try not to needlessly move them without any purpose.
Hi, I'm pretty low-rated and don't ever expect to be an outstanding player but looking for some advice on some very specific weaknesses I have identified in my game:
1) Making very silly blunders (mostly in the transition from the opening to the middle game)
2) Not really knowing what to do with my pawns after pieces developed, particularly ones on the castled side leading to avoidable mates (think getting better with non castled side)
3) Missing key defences when in winning positions (for example recently taking a +5 position with 4 pawns on 1 to mate in two by missing a single pawn defence)
4) Tunnel vision meaning I miss my opponent's blunders and therefore do not exploit them
Also generally any tips on how to best prep for the first game of the day? Always gonna be a better session if you start with a win.
Cheers!