Please assist me to improve my game

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Wahidz

I feel I wasnt able to maximize my opening and wasn't able to get an advantage. Or i may just miss the tactical shot big time that turn the winning game into a draw. 

I'm 1700 plus and I'm playing unrated player, so disspointed :(. 

Did I play my opening correctly? or I should have played botvinnik to maximize opening advantage?

how do you handle 1.c4 g6?

I was into time pressure and miss 40. Rxc6, how to improve my game in this issues?

I draw in an end game which should be winning? what end motif should i priority as 1.c4 player?

Looking on this game, please assist me to improve my game.