Ortur Lasermaster no longer cuts like before

Have you inspected the lens ?
How many hours do you have on the machine ?
If you have a clean lens and the machine is not really old / used you could also have a failing power supply.

• LWE

  : I have not and it has MANY hours on it.

Cleaning the lens is the first thing you should do. Depending on your usage, you need to do that even daily. If the dirt is burnt into the lens, you need to replace it.