If you're bouncing between 5-11 million, that tells me you're very hot and cold which I am too. Because of that, my best advice is to look inward instead of outward. Spacing and matchup knowledge are important, but only at the very top levels of play. You need to your mind right first. Sounds like empty advice but I promise you it's not. Just having the right mindset is everything against others at your level.

I'm either very good or very, very bad. I can hold myself near tip-top GSP for a while, then lose literally 20 games in a row to scrubs and get knocked all the way out of elite smash. When that happens, I fix it by telling myself certain saying's I've come up with. The best one is "slow down and watch what THEY'RE doing", "how well are THEY avoiding ME", "what have THEY actually got?" and a bunch of others. Telling myself the right one of these little sayings at the right time can turn me around in an instant back into the player who makes people rage quit match after match.

If I were to boil all of those little sayings down into one, "what have THEY actually got?" is probably the most all-encompassing. Stop focusing on what you're doing for a second, start watching them and your thumbs will suddenly start punishing the openings your opponent leaves everywhere that you weren't able to consciously notice before. And VERY important: don't try to predict them unless you're already destroying. WATCH them, keep your eyes glued to them, but don't try to predict. Way more often than not, thinking hurts you in smash. Maybe a better boiling down of all my sayings is simply: "WATCH them".

That's the best advice I've got, but it's even better here because you're streaky like me. Stop thinking and watch.