NO. Don't even level "slowly". Don't level at all! You wouldn't want to dig a deeper grave for yourself than you have now.
It will take long, very long time of absolute level-freezing before you can pick yourself up. But it will happen, eventually.
Keep freezing your level, avoid all sorts of exp no matter how small they are. Patience will reward you someday.

As Renji pointed out, it would be wiser to set a goal, reach a certain power before hitting 80.
But I somewhat disagree with 50k. I'm at level 77 with 55k power, and very rarely do I get top 1 (coz some * whale literally hunts level-freezers down in our SWB).
To be safe, try to reach up to 55k before you hit 80, that way at least you'd have guaranteed 2nd or 3rd place on each SWB.