Small business insurance

Hi! My dad has founded a small welding company back in 2021. We have tried to look for insurances but so far, no luck. The few that we have communicated won’t either not insured his company or it’s too expensive.

Like mentioned, the company is over 2 years old and he has had a project here and there but not enough for him to quit his current job. Being uninsured has affected the company since some contractors have asked proof of it.

For context, he doesn’t have a shop, he has a trailer where he goes on site for the job. Since he doesn’t have a shop, his company address is our home address.

Any decent insurance we can try to contact and see?