A set of vice grips.
They can be used to unbolt those nuts you rounded off with the cresent wrench. A cresent wrench is great if you are limited in the tools you can carry. But using the right wrench is a much better choice.

So

A full set of wrenches both metric and inch. Because of the expense get the type you will probably use the most first.

The same sets of socket wrenches.

A couple of cans of penetrating oil. Nuts and bolts rust and or get stuck.

You might want to pre-make sets of plywood window covers. Then if a window is broken or something like a hurricane is coming it only takes a few minutes to put up. Instead of hours to make.