QuantumMechanicc,
OK, I will take your post at face value, assuming that what you say you believe to be true - though I actually doubt parts of it are accurate.
I have examined (very quickly) three of your last Live Chess games (128691909, 128689669, and 128583612). In each of these you made rather obvious tactical errors, as follows:
91909 - Failed to see the knight fork, losing material, after your 16. ... g5.
89669 - Resigned after Bxf6, thinking that you had to lose significant material, when I think you still have some resources.
83612 - Dropped a knight at move 11.
Again, I haven't put a computer on these to see if I'm completely accurate on my assessments, but I'd say that your ability to see up to 5 moves ahead is not being effectively and regularly exercised.
This, I believe, is the first thing to fix: failing to see opponents' or your tactical opportunities.
As for fixing it, certainly studying tactics and looking harder in your games for tactical affairs can help. One does need knowledge, but chess is largely a game of skill development as well. So, ...
I recommend looking over your losses to identify these occurrences, try to think through why you didn't see them, make a flashcard set with the tactics YOU missed, look through those periodically, and play with a focus on not missing tactics. If you have to play even longer games to do so, then do that - but you might not have to.
Best wishes ...
I am 16 years old, have been playing chess with a detailed knowledge of the tactics and positional play for maybe 3 years now, but I've always remained a 1,200 rated player.
This has probably been posted numerous times before, but I couldn't find anything which suited my needs.
I have a good memory and have memorised all of the openings and their variations move by move, have studied all of the positional details, have read the books of Aron Nimzowitsch, but, I nonetheless find myself unable to increase my rating.
I can see perhaps up to 5 moves ahead but my oponent will always be ahead of me and will I'll end up making a silly mistake and having to resign.
I know this is a probably many, if not all of us, suffer from. So what are your remedies?