You might have a fixed/fixed hub since you can always pop a freewheel on a fixed thread.
But unlikely.
Why not buy a nice new hub and learn a little wheel-building!
It probably isn't best practice but I bought a (fixed-fixed) hub from On-one for £15 and just reused my spokes.
So a fresh-ish wheel cost me £15 plus a spoke key and some rim tape.
You might have a fixed/fixed hub since you can always pop a freewheel on a fixed thread.
But unlikely.
Why not buy a nice new hub and learn a little wheel-building!
It probably isn't best practice but I bought a (fixed-fixed) hub from On-one for £15 and just reused my spokes.
So a fresh-ish wheel cost me £15 plus a spoke key and some rim tape.