Prevention of varicose veins

I am curious about ways to prevent varicose veins in everyday life.

Since it's an office job, I spend a lot of time sitting.

My legs are very swollen~ I try to relieve the swelling by doing L-leg stretches or stretching before bed.

Is there a better method besides compression bandages? I don't want to go as far as the procedure stage, so I want to prevent it early!