I wouldn’t worry too much about public transport unless you’re in a big city. Most people that aren’t in a big city, tend to drive. I agree, 90% of my clients drive to me anyway. The only clients that don’t are the ones that actually work in the city I’m in and walk over whilst on lunch / after work.
My friend works from our town (population of around 18,000 and 57% being 18-64yr old)
She does okay and doesn’t even work hard to advertise, never puts her AT on etc.
Clients will happily drive 30 mins in my opinion so that really widens your radius, plus some will drive further.
If it was me, I would work on advertising in the new place, see how it goes. It might take some time to pick up new clients etc. If things are quiet, pop into the city you’re popular in by doing mini tour