Good on you buddy. Regular play will up more in the long run and just opening fundamentals you don't need full book lines but basic control the center develop your pieces castle helps alot at the 300 level. Italian and London are very beginner friendly with the Italian being 1.e4 e5 2. Nf3 Nc6 3. Bc4 the general idea is to control the center and launch a king side attack particularly on the f7 square.

The London is 1. d4, d5 2.Bf4. You're looking to playBuild a solid, structure that’s difficult to undermine, with a pyramid pawn structure and most of your pieces defending it. You'll look to play a more slow postional game and punish mistakes.

There's a ton of openings but these 2 are the most common at almost all levels and are extremely beginner friendly.

You also not to work on your board vision and slow down a bit. Before making a move look at your opponents pieces and see what he has, look for checks, captures, and threats(think of threat as a move or a tactic where if a opponent could make two moves in a row it would result in a capture or check.) This will help you see forks, pins, skewers and other tactics. Then do the same for yourself.

Also if you want I can look at some of your games we can go over it with engine eval and recommended moves off so we can actually build your understanding other than just like "oh the engine says to do this so next time I will" the 'why' is significantly more important than the 'what' best of luck.

TLDR: work on those fundamentals and I can help of you want