I need a solid plan to get out of 300 Elo

Improving Your Chess - Resources for Beginners and Beyond.....

https://www.chess.com/blog/RussBell/improving-your-chess-resources-for-beginners-and-beyond

I wouldn't reccomemd 30 min. Even if you start winning more, you will still gain slow due to how long 30 min games can be

Nobody will tell u this tip. People keep repeating the same thing over and over, "just study basics and analyze match" NOOOOO

Learn and stick to one opening only. Just play one opening. From that opening, u will learn alot in chess until you reach the 1200-1400 level then u can start to expand ur opening theory. So learn and play one opening only. For example, learn the london or italian for white, and kings indian for black. and just play the games out. This is genuinly the best tip that you can get. Trust me, you will climb if you listen to this and apply it

Watch videos

Study → Practice → Fix → Repeat

This is the framework I use with students I coach.