Usually, it's not a big deal, as people who sail there have contracts with Towboat US or Seatow, where you pay a modest fixed price per annum for unlimited tows.
A lot of people do have towing contracts, but take your time before calling for a tow. A hard tow if you're stuck can result in damage. Often there is no great rush in trying to get off, and if you can wait for the tide to help it is gentler to float off or at least get less stuck. More than once I have simply shut things down, put out an anchor
towards deep water
, and had a snack or something while waiting for the tide. One time in the Keys we fired up the grill
and had a nice dinner while waiting for a few inches of tide help. Sometimes a passing powerboat wake gives you just enough lift
to help you back into deeper water