Study Simplification

I played a fair amount of chess and like to improve my playing. Currently around 1400 in correspondence. I only play online correspondence chess. On a different site before but now I’m here since it has such a big community and tools. 

I’ve gone over the recommended study plans and it’s a little overwhelming to see how much there is to learn on the road to mastery. 

I like watching chess videos. They make the most impact on me. 

To radically improve my chess and become a 2000 online chess (correspondence) player what is the best road to walk. What’s is necessary and what isn’t. 

Let’s call it a simplification of the study process. 

I rather play 3-5 games at 5 days per move and study each opening in depth and take my time to move. Study while playing. 

Besides that, what are the best things I can do to deepen my understanding to progress?

Anyone?