I currently have 1500 Elo on chess.com and recently I feel like I reached a bottleneck, it seems that no matter what, it is difficult to go higher.
Considering that I want to reach 1800 which books are recommended?
Probably I am facing strategic problems, for example I can develop the rooks, by connecting them, then double them on a column, but then I don't know anymore what to do. Sometimes I can reach the 7th rank, but other times it seems simply pointless to double them.
Similarly, I develop other pieces, I can reach good positions, but still I don't know how to fully utilize them at full extent
Last, I am still having problems when the enemy launch it pawns at me on my castled side and I have to use my paws to defend.