Playing above ELO

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I don't think you're at the stage of refining your strengths quite yet. Still need to learn all the fundamentals. Also I wouldn't worry about fair play violations, if you aren't doing anything what's there to worry about? Any strikes and they got it wrong. You couldn't have done anything differently.

Longer time formats

What you’re describing is precisely the reason it is recommended to play longer time controls. It gives you the opportunity to think about a position and consider your options. If you have only 5-10 seconds per move, you’ll end up just guessing most of the time.

I’ve analyzed your game vs harshipant4.

Opening principles

Don’t be sloppy with opening principles, it’s perhaps your biggest weakness. 1) Develop your pieces early. You’re already doing that. That’s good. 2) Castle early and make sure your King is safe. Take a look at the position after 23. Rhe8+.

Your King is hopelessly exposed and vulnerable. Even if you hadn’t blundered your Bishop on move 21, you would have a hard time defending your King. Also try not to move pieces twice in the opening. If you move your Bishop for the second time on move 5 (Be2), you’re simply wasting a move.

Puzzles

Practice tactics by doing puzzles. You train yourself to recognize common patterns. This is the position after 15. Nxd5??

Once you’ve played enough puzzles you will see tactics when they are available. If you can see opportunities like this, your results will skyrocket.

Candidates moves

Take time to think. All your bad moves were played almost instantly. For example, the position after 20. Kg7, where you blundered your Bishop after just 8 seconds. Especially in such a tactically complex position.

You need to identify all relevant candidate moves and evaluate the positions that follow. Castling? Better late than never and probably your last chance to castle. Or Qxb7+? Or take the hanging Bishop with Rxb2? Even if you can’t calculate the exact outcome of each candidate move, merely the act of considering them all will lead to better moves. They all are better than Bd4+. Remember You can’t play what you don’t see.

Accuracy

Finally, regarding your 97% accuracy game. That’s perfectly normal in short games when your opponent blunders in the opening. Because it was such a short game you only had to play perfect for 9 moves (book moves don’t count). And your opponent’s mistakes helped you, all you had to do was play the obvious moves. And you did. The result is you playing almost perfectly. Which is great, you did well. But it won’t set off any alarm bells.

Hope this helps. Good luck

And your opponent’s mistakes helped you, all you had to do was play the obvious moves

It's natural for your rating to fluctuate, especially as you improve. If you are playing better than your rating, you will eventually be matched against stronger opponents, which will help your rating adjust to reflect your true skill level.