In current canon, Boba Fett has recovered Slave I and uses it again around 9 ABY. This is shown in:

The Mandalorian's Season Two

...and likely the upcoming series The Book of Boba Fett.

It hasn't yet been shown what happened to the ship between Return of the Jedi and then.

In current canon, Boba Fett has recovered Slave I and uses it again around 9 ABY. This is shown in The Mandalorian's Season Two.

In The Book of Boba Fett's Episode 4: The Gathering Storm,

its recovery is shown in detail. Bib Fortuna had apparently been keeping it in the garage of what had formerly been Jabba's palace: Boba recruits Fennec Shand to sneak into the palace with him and recover his ship. While dozens of guards try to stop their attempt, they are ultimately successful and manage to escape with the ship from the garage.