How to get better at early middlegame

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StevenEmily

My friend said that the way I play games is to make a comeback and I've noticed that's actually kinda true

It means I'm worse at openings and early middlegame and better at middle-late middlegame and endgame.

Improving in openings seems simple but how do I improve in the early middlegame? Note: I don't play a specific opening

Random opening example:

Random comeback example: