Looking on the internet deeply has found these results:

in the next level, is the most popular phrase on the web.

at the next level, 195,100,000 results on the web	in the next level, 12,780,000,000 results on the web More popular!
Some examples and use cases from the internet:	Some examples and use cases from the internet:
That goes to the next level, and these layers are organized in conceptual levels. You're rising to the next level, recruit. Probably take it to the next level, sir. Probably take it to the next level, sir. Go to the next level, weirdo. But calculating this at the next level, that means at the business sector level, is important. However, at the next level up, the migration of UK financial houses to larger and larger transactions is leaving a funding gap. I'm already on the next level, man.	Probably take it to the next level, sir. You're rising to the next level, recruit. You need to take it to the next level, pronto. I'm already on the next level, man. Go to the next level, weirdo. And as much as I want to immerse myself in the Seek and in the next level of existence, I cannot abandon you all. That goes to the next level, and these layers are organized in conceptual levels. Probably take it to the next level, sir.

at the next level,

195,100,000 results on the web

in the next level,

12,780,000,000 results on the web

More popular!

That goes to the next level, and these layers are organized in conceptual levels.
You're rising to the next level, recruit.
Probably take it to the next level, sir.
Probably take it to the next level, sir.
Go to the next level, weirdo.
But calculating this at the next level, that means at the business sector level, is important.
However, at the next level up, the migration of UK financial houses to larger and larger transactions is leaving a funding gap.
I'm already on the next level, man.

Probably take it to the next level, sir.
You're rising to the next level, recruit.
You need to take it to the next level, pronto.
I'm already on the next level, man.
Go to the next level, weirdo.
And as much as I want to immerse myself in the Seek and in the next level of existence, I cannot abandon you all.
That goes to the next level, and these layers are organized in conceptual levels.
Probably take it to the next level, sir.