How to develop my chess

Good day everyone!Well I have successfully reached the rating level of 1800+.I want to improve my chess further.I want to reach atleast 2100+ rating level.Well I already know fundamental chess principles and basic strategies.When I analyse my games,I find that I'm still weak in positional play,general middle game plans and difficult endgame positions.How can I improve in those areas ?

How should I train ? I mean what should I do during training.What training methods I should follow.Please help me !

thanks cnjohnson......i will practice to play gambits during trainings N study some gambit games !

play more queen pawn opening games. :p

You're ratings say otherwise your nowhere near 1800+ (A class strength)