There should be a lot to find on the internet. I don't think there is "just one right answer" here btw. I can only give or try from my own experience. I play 18m sng with 14% ROI.
- check general relations [VPIP, PFR, 3bet] only starting to become relevant at about ~100 hands or so:
> 11/10/2 seems to be the typical nit player.
> 18/16/6 seems to be the typical ABC standard TAG player/reg.
> 22/20/9 seems to be the good agressive regs.
If it looks more like:
50/7/2 = loose passive. Playing way too many hands, playing them way too passive. Will bleed chips and/or lose against a tighter range.
41/32/14 = loose aggressive. Playing way too many hands, playing those weaker holdings way too aggressive. Will blow up eventually.
5/2/0 = tight passive. Playing way too little hands, playing them not agressive enough either.
- check stats per position: from UTG tight to BTN loose? look for gaps or strange patterns.
If you don't filter for stacksize, the main thing you want to see if the stats increase when moving more towards the BTN. If they don't, then you aren't opening wide enough when you have less players behind you to act. You must look for "position awareness".
- check stats per stacksize: the shorter the looser? does your opens match your stacksize (both sizing and range)?
In SNG's, unlike cash games, you just can't wait for the perfect hand to come by. With the blinds (antes) increasing, you should open up your game.
- check shoveranges: (what) are you shoving 8-10bb, 10-14bb, 15+bb?
- check bubbleplay: filter for 5 handed play and look up situations. Hero is short, Hero is midstack, Hero is Bigstack
These two are just things to look for in the end. Especially bubble play and mastering decent shoveranges (with villains tendencies in mind and proper adjustments to them) will give you an advantage over a good part of the field.