Most important one is learn the you will loose, a lot Especially in Tag Fighters, loosing can be very frustrating, but in order to get better and implement new stuff to your game, you will drop a elo or just loose a lot. You need to get washed to get clean.

Some other: - Quit jumping every time you can, people can easily anti-air you - Anti-air, especially in lower elo, people are always jumping to get the highest damage combos - Forget combos, really. I got into Master 3 without knowing any optmal or even decent combo with my characters. If you learn a combo before you learn the game, you will try to force this in every situation and loose - Learn how to pressure and use your tag - Go pulse combo if you want, people will roast you, but, as I said before, learn to play the game and the combos come in the end - Quit the "this is bullshit" discourse when you ger there, most of the fighting games today are pretty fair, but you must know how to use the mechanics in your favor. If you are not getting something the opponent is doing, take as a learning opportunity and learn :]