This topic is to exchange advice and stories on the way to accruing more wins (or maybe your first win).
Most of the time, I target for KOs. The more KOs you get, the more badges you get, which increases your attack power later in the game.
Sometimes I'm halfway through the game without any KOs. This is when I start gambling a bit and I'll temporarily target Badges right before sending a long combo, because you also gain all the badges that player had upon KO.
Whenever 3 or more people are targeting me (or 2 in the late game), I target Attackers and start clearing a bunch of single or double lines, because you gain a flat bonus on all your line clears in this situation. This is the most consistent way for me to get KOs. Don't panic if you see 10 targets on you right at the start; the garbage timer is very generous at the beginning.
The very short version of my stacking strategy is to always plan a few pieces ahead and to create situations where you can combo repeatedly. It's hard to go into more detail than that, but luckily I can show instead of tell.
I personally don't go for T-Spin Triples, because they're lame and the rotation system is still lame