we are on lockdown here too. im automotive "essential" business, but not many cars coming in for repairs due to the lockdown lol.
Well you can simply phone existing customers and do a pick up & delivery.
Then we have been picking up a few cars belonging to essential health workers (doing the virus fight) and fixing the basics for free.
Mostly at the moment batteries, starters, alternators, and belts etc. Simply basic maintenance stuff
I am sure we will expand our customer base eventually when things improve by investing in the community.
Talking to my brother who has a shop in the UK he is doing exactly the same thing.
All the best
Dennis