Really? I'll just do like 50 solves tomorrow.
Just make sure you're paying attention while doing your solves. The fastest bigcubers aren't lying when they say that most of the cool tricks they know were picked up in regular solving.
Force yourself to turn
really slowly; burst turning will do you absolutely no good (2 TPS over the whole solve is plenty for a sub-2 minute average with a reasonable movecount; 3 TPS would put you near my speed). Actively watch for shortcuts during centers. Take chances with potential 'tricks' even if you aren't sure if they'll work; at your speed, the time lost in the solve by such a trick failing is no big deal, and you'll learn something useful whether it works or not. Over time, shoot for your movecount for all 6 centers to be in the 60's every time (yes I know I said I basically just did a lot of solves, but every once in awhile stopping to do a few centers slow-solves to count your moves and check your efficiency isn't at all a bad idea).
Similarly, make an active effort to turn really slow and look ahead during edge pairing. Once again, burst turning does you absolutely no good here. After pairing up a tredge, don't just store it away and
then start looking for the next edge you want to use; rather,
do not remove the edge from the M/E slices (whichever you use to pair) until you have found the next edge to work on, and make sure that when you do remove the completed tredge to store it away, you do so in such a way that you bring another piece for your next tredge into the M/E layers at the same time. Save moves by giving yourself a lead on the next tredge at the same time as storing the previous one; don't put yourself into the bad habit of wasting a lot of extra moves just because your lookahead wasn't successful enough.
For L4E, don't worry about trying to get into a specific system, because the cases can just be so different. You simply have to get used to this step; you will gradually figure it out for yourself. There isn't much anyone can say about this step without just showing a bunch of examples.
So, like I said, just keep solving, but make sure that solving isn't completely mindless, and you will improve quite fast.