Upon looking some of your games, I realized that you blunders a lot, don’t worry much about it, every grandmaster or all chess player blunder but the thing is that they do not blunder often.
Let’s watch one of your game which you managed to win.
Now the very first thing you need to fix are blunders. How should you stop blunders?
There is one rule to avoid blunders, which is to protect your all pieces and pawns and do not leave hanging pieces. And the same rule applies when you see hanging or unprotect pieces and pawns just attack and win.
Opening Suggestion
With white pieces you like to play Viena game which is good at your level, and with black pieces you try to create same setup.
One more thing I noticed that you are attacking chess player, you like to crush your opponent in the opening which should be the goal of every chess player but there will be some consequences.
So play Viena game and learn more about its theory, and with black pieces also create your opening repertoire .
Middlegame Suggestion
The middlegame is very complex for your level, in order to avoid complexity you should learn opening theory like Viena Game, and in its theory you will learn plans about middlgame. Also look for breakthrough and sacrifices.
Endgame Suggestion
In most of games, you never reached in endgame either you won or lost in the middlegame. Its my suggestion that you should start learning endgame, especially start with pawn and king endgames.
Conclusion
You should focus on how to avoid blunders, I have revealed a trick above for resolving this issue, please do have in mind next time when your are playing chess.
Let’s summarize all my suggestions in Mind Map.

Thanks Nasir, this is a very helpful study.
I am working on the Vienna for white and enjoy playing it, learning more theory is definitely something I will do.
Your observation of my tendency to attack before completing development is correct, I have developed a habit of doing that, which is adding to blunders and leaving pieces hanging.
In the example game, there are many times that pieces were hanging that my opponent did not take. I think the game result for me was more luck than planning, given the number of times I left pieces hanging.
Thank you for your review, it is very helpful and appreciated!
Appreciation will boost me, please do share it to others, Thanks