At your level you can improve lots by tactics and endgames! So to say, you have the right books.
My advice is use an hour for tactics. [Do not advertise other sites - Mod. Sorry Mod] If you want, before the session of tactics, read a small amount of your tactic book and try process what you read.
Then use an hour on your endgame. Read a chapter of the book or so and try to play the endgames you learned vs a computer.
In the final hour, I suggest you play a few quick games. 10/0, 15/0 or so and analyze them after yourself and try spot your tactical mistakes yourself without using a computer. At your level the computer will have eval shifts every move and you will have too much to plough through.
I have never used this method myself, but for you I came up with it. If that sounds good to you then do it.
Resources I have: CT-Art, Jeremy Silmans Endgame book, chess tactics for champions, Logical chess move by move.
I want to be at least 1500 by december.