Find a good independent shop. It’s not always the case but you can start by looking for AAA approved “top shops” in your area.
For no-crank no-start conditions I start the diagnosis at 2 hours. This gives my electrical diagnostic technician plenty of time to start at point A and work his way through all possibles. I always get a customer to commit to 1 hour of diagnostic time for drivability issues where the vehicle is self-propelling, and 2 hours for engine/electrical diagnosis.
Committing to $200 for a proper diagnosis also ensures you won’t get a long list of half-assed “maybe” causes.