Ripper, I'm going to give you some fairly specific advice for reinventing your game a bit preflop:
1. Start with the Chen formula. Choose a "golden number" that you feel is generally good enough to raise with from any position. I think for micro MTT's, 8 should be a good starting point at 9 players. Never limp the SB with less than a 6. If you are not used to the Chen formula at all, just play like you always do, and when your hand is dead, pracice calculating the Chen formula while the rest of the table is playing until it becomes automatic. A lot of the Chen formula becomes very obvious after a while -- like A-rag suited is always a "7," etc. The point of using the Chen formula here is to expand your range into reasonable holdings that you might not otherwise play. As the table diminishes, lower your "Chen number" as you decide. Experiment! When you raise with a hand like 76s and get bet into when the flop hits you because everyone thinks you are playing broadway, it's a wonderful feeling to get paid off, and you will quickly develop a "dangerous" image. At 4 players, a "7" should be good enough.
2. Use a hud (I prefer Jivaro), and after ten hands, subtract "quarter points" for limpers with low to medium VPIP, and ignore limpers with high VPIP. Add a quarter point for the cuttoff, and a half point for the button. Before the 10 hands, subtract a quarter point for every limper ahead of you. After you get some stats on PFR%, start subtracting for different raisers different amounts. For instance, a player with a VPIP of 70% with a PFR of 35% after 20+ hands, I wouldn't subtract anything from my holding. But I would subtract at least one point for a lower PFR%, and I would toss the Chen formula aside completely when facing a big raise from a nit, look down at my cards, and ask myself: "are these two aces, two kings, or two queens?" You get the picture.
3. Continue working out your own formula, assigning additions or subtractions quarter/half/full points according to what your hud
tells you about the other players in the hand, and lowering your magic number as the table di9minishes. The main thing is that you begin to develop a really great sense of how to play speculative hands strongly -- THAT is what wins micro MTT's and Sit 'n Gos in NL Hold'em.
4. Stop limping too much, if that's what you're doing. This is one of the great things about using a HUD. When a nit limps 5-handed, and you look down at a Chen-7, it's okay to limp behind. But if you're in the cutoff with a Chen-7 with nothing but loose limpers ahead of you, or no one at all, you need to raise, period. This needs to stop even being a question in your mind -- it shouldn't even be a decision.
Post flop is a whole other ballgame -- and that's how you treat it! If you are considering preflop action post-flop without a really good reason, it's a mistake. If you raise and get called by a nit, and the flop hits you, play the flop the same way you would against anyone. Stay consistent -- don't let another player's image override your own. Even when you fold -- fold with conviction. Like, "Nope. Wrong guy, dude! Cya!" If he shows you a
bluff, just have the attitude that you know who's coming out ahead of that deal in the long-run.
Honestly, the #1 thing you can do to improve your game is to improve your image, and that comes from being strong and consistent in your post-flop play, but consistently unpredictable with WHAT TWO CARDS you are playing with, and using the Chen formula to decide which hands to play is a pretty decent way to really mix that up.
Anyways, good luck, and I hope you'll at least give it a try.
Oh, I forgot -- one more thing: remember that unless you are playing orange/red zoned, or with a monster from early position, your raises should be strictly for value, and around 2.5x every time. Also, stay young at heart! You sound like you might be older like me (I'm 48 with medical issues and the whole shabang) -- I could be wrong. But if you are, do like I do and stay "with it" daddy-o! Hehe, Seriously -- keep a young attitude.