The only way to make the ground pressure reach or approach 220v is to find a way, so either change the power supply line or use a voltage regulator, and you can figure out which economy. I just encountered this problem at the end of last year. A jewelry exhibition hall was set up at that time. When the electrician was wiring, he used a 1.5 square wire to pull six 150w metal halide lamps for more than 30 meters. Effective, but unstable, sometimes not. At first I thought it was the lamp, so I checked it. Later, it was found that the voltage was insufficient, so a 4 square wire was used to solve the problem.