Why not just use a stop Loss and rake in the gains?

Ok so I'm thinking of putting $20k in QQQ and raking in some gains.

This is in my ROTH by the way so no taxes.

Here's my plan.

Put in $20k in QQQ and set a 5% stop loss.

So for a little bit I'm risking a 5% loss ….. no biggie.

So I set a 5% stop loss and let it ride.

So I've gotta gain over 5% to have any type of gain.

Once I hit say 6% or so there's no risk anymore of losing a dime!

Of course I probably would wait to do all this when QQQ gets back close or so to it's low as we're pretty close anyways.

So are there's risks to a stop loss plan like this?
I don't see any really.