Most of this has already been said but here is my 2 cents FWIW.
You already understand how to get to the deep stages if tournaments via your own description- so if you do not have one I would recommend a program like poker tracker 4 specifically for the purpose of storing your stats, results, and your hand histories. Reviewing your hands and sessions can be VITAL. I cannot express how much this will help you grow as a tournament player. We all do things in game that we may not find correct under review - the point is recognizing and correcting these spots so we start bettering our in game play and strategy.
Flips are essential in tournaments - you have to win a few to make the deeper runs and final tables. This is where a tracker program would come in handy - you need to look at your flips/all in situations and find out if you are making the right decisions. Maybe you're calling off a little light, maybe you are not calling off wide enough and you are playing too snugly. There are lots of charts, programs, information out there to help you better this aspect of your game.
Finally you have to understand the nature of MTTs and how they play out. Some of the BEST MTT players in the world cash in 20-25% of the games they play. Take that in for a second....the BEST players in the world are losing 75%+ in these things! So how do they make money then? Good
bankroll management and by scoring big here and there. A top 3 finish should pay you nicely in most MTTs. So that being said, you should have yourself in the correct mindset to handle these games as they have the highest level of variance in the game.
So recap - mentally you need to br strong and understand how MTTs are going to play out most of the time. Secondly make sure your plays are correct, study, find out if you are playing correctly or not - which brings us to the 3rd - get a tracker program! You dont need the HUD to begin with, utilizing it to review your hand histories and log your stats will be hugely beneficial. The other features we can incorporate later.
One final piece of advice- even the most winningest players to date are not above study and learning how to improve their game. Take advice with a grain of salt and apply it as you may - but dont shut yourself out from others perspectives because you KNOW you are a winning player, that's just limiting your knowledge and soon enough the better player will leave you behind.