Alright then....first things first. Post a screenie of your squad and WE'LL judge if they are any good.
Here are a couple of things (and some 'golden rules', if you like) which may help:
1) don't piss about with your tactics every game, especially not 'in game'. To give a tactic a proper test give it about 5 games to fully kick in. Giving your players contradictory instructions every five minutes will just confuse them.
Incidentally, what tactics are you currently using? If you don't have a good one I can mail you one of mine, or perhaps one of the other lads will if your stuck.
2) Only play fresh players if possible. I don't play a player under 95% condition unless I really have to.
3) Get good coaches and fill up all of the coaching positions. Good coaches are essential IMO and most clubs, even the top ones only start with one or two. I always use 5, which gets my younger players stats up quicker.
4) Does your keeper suck anus (like Rony watching Man City, eh TROD)
Chiotis can be picked up for very little money and is a top class keeper.
If you can get through that lot then you should be able to get some significant improvement.