Creality Falcon 10W Not Cutting Through

My Creality Falcon 10W is not cutting through 3 mm basswood. I’ve had it almost a year, but haven’t used it much since I mostly use my CO2 machine.

I understand that the lens might be dirty – is it possible to clean the lens? (I ran it the first month without the air assist.)

Besides doing the fine detail etching on the Falcon (which is sharper than my CO2), I want to learn to do etching on white tile (Norton white tile method?) and glass. If you can point me to any tips on doing that, especially etching photos, I’d appreciate it.