Here’s how I’d fix Return of the Jedi:

Boba Fett gets a better death instead of being simply thrown into the Sarlaac pit
I’d fix the “Luke and Leia are siblings” thing by removing the cheek kiss in A New Hope and both incest kisses in The Empire Strikes Back.
Remove the lines “So it is true, from a certain point of of view.” and “A certain point of view?”, immediately cut to Obi-Wan’s speech to Luke about Anakin.
Endor is replaced with the Wookie homeworld, obviously (Ewoks are replaced with Wookies)
Remove Ackbar’s “It’s a trap!” line, a line so bad that it has been mocked by many as a meme for a long time.
The second Death Star is replaced with Palpatine’s flagship, similar to the Supremacy in The Last Jedi.

ENDING CHANGE:

When Luke is attacking Vader, he slashes the helmet off, as we see his face. Also, when Palpatine is electrocuting Luke, Vader, having redeemed himself, decides to fight Palpatine off as he gets electrocuted, sacrificing his own life and allowing Luke to escape. Palpatine, realizing that the Empire is close to its destruction, orders the remaining Imperials to rebuild in the Unknown Regions via hologram before he and the remaining Imperials flee to the Unknown Regions (Vader witnesses the hologram part as he dies).

Palpatine’s flagship is destroyed. Upon returning to the Wookie homeworld, Anakin’s ghost appears to Luke and warns him that Palpatine will return and the Empire will rebuild in the Unknown Regions. Luke tells Leia and Han about this, as he comes up with a plan to rebuild the Jedi Order while Han and Leia reform the Republic to fight against the rebuilt Empire as it becomes stronger than ever. This would set up the sequel trilogy.