Calls come in for panel swaps and dead outlets while you're up in an attic, and the missed caller just hires the next sparky on Google.
Publish services and available times so customers can submit a request while you finish the current job. You drive across town for a quote on a service upgrade that ghosts you the second you mention the price.
Require a deposit to lock the visit so part of the job is collected before you make the trip. Bigger jobs mean material up front, then you float the cost for weeks waiting on a check before you're made whole.
Send a quote, collect a deposit toward materials, then record cash or email a card invoice on completion. Payment status stays with the job.