Improving from class d

I am currently class D and trying to improve.  

I am doing chess puzzles which are good but only help with tactics.  Is there a way of practising other parts of the game, strategy, planning etc.  I have recently started getting a random GM game, analysing the position and trying to guess a move.  I write all this down and post it to see where I went wrong.  Is there a better way of doing this - apparently Yusupov's chess series is good?

Thank you

Guessing moves from GM games is a good exercise.  Bruce Pandolfini has been offering a "Solitaire Chess" puzzle in the US Chess Life magazine for years. He gives you points for guessing important moves and keeping score can help you get motivated to do more.

You are doing tactics puzzles? Where? Not here. In 3 1/2 years, you have done only 52. In that time many people would have done 500 or 5000. If the time control is too fast, just turn it off and think about the problems as long as you want.

My favorite hobby is to play through master games. I especially like the annotated books on master games. I do this at least 6 to 7 hours a day. It's all in good fun. :)

Seriously, start with watching Akobian's St. Louis chess videos on youtube. They're great for simple starting strategy - you'll learn a LOT, even at class D.

you can go from D to C with reassignment surgery. And the B naturally comes with the C