It's really hard to see your problems with your opponent blundering so often. Only thing I really saw was your C-pawn hanging. Most of the rest of the game was you exploiting your opponents weaknesses.
At 15. Nxe5, which lead to you winning a pawn, I was even impressed. I don't think I would have found that move.
If your experience follows mine you are not due to have some breakthrough moment when all suddenly becomes clear. Rather you gain some insight by imperceptible increments as experience gradually grows.
Which leads to the simple advice to use your time playing games rather than studying.
I will offer one tip. When getting into the early middle game don't spend your time looking for any very grand plan. Rather look for one or two or three simple ideas. How to improve the position of a particular piece; how to expand the space you have; how to cut down the options available to an enemy piece. If you come up with a couple of ideas like this tactical chances are quite likely subsequently to emerge by themselves. And once you have some advantage - a pawn majority on one wing or the other, the two bishops, an extra pawn, whatever, then a strategic plan may well follow.
So start out by thinking small.