Like most I think Mace is in a dire need of a re-work. That is obvious.
But there are 2 other Jedi Related things that, imo, should be addressed.
First is the lack of any sort of an auto-tank for Jedi. Either re-work guardian to be one, or bring in a new character.
I Personally vote for Corran Horn
During his training at Luke’s Jedi academy, it was discovered that Horn was gifted in precognition allowing him to see glimpses of the future and dodge blows that would kill other men.
He was also an excellent pilot which opens door for a jedi squadron. Which there should be as well that plays into the final Jedi thing that needs to be addressed.
Luke needs a ship.
the XWing and luke has held a strong bond in all star wars lore and legend. Luke flew his Xwing to blow up the deathstar, he flew his xwing to Dagobah to train with Yoda and used the force to raise it. He used the force to raise his xwing from the waters in the rise of Skywalker.
His XWing has even shown up in the Madalorian.
Luke needs his XWing.