Marike,
Sunken cats can be repaired including the engines. Most
electrical things that get wet cannot be repaired. So try to remove any
electronics that are still dry and store somewhere safe and dry.. That is assuming it is safe to get on the
boat.
Engines (but not the starter or
electrical end of the generator), manual winches,
sails,
steering gear (not autopilot), hulls and the like can all be repaired. It will be a lot of hard
work. Unless you are experienced in
fiberglass work leave that to a pro. Cosmetic issues in
fiberglass don't have to be fixed right away. You can always tell other cruisers they are Irma scars and you will probably get free drinks.