What I think would be a good thing is dropping all the subclasses you can get for free on DnD Beyond. You don't need them in the book if you can just print them out from the website.
Barbarian: Drop Berserker, add Ancestral Guardian
Bard: Drop Lore and bring in Glamour
Cleric: Drop Life for Order
Druid: Drop Land for Shepherd?
Champion: Drop Champion for Samurai
Monk: Drop Open Hand for Kensei
Paladin: Drop Devotion... I guess invent a new one? Man, the Paladin options suck!
Ranger: Drop Hunter replaced by Monster Slayer I guess
Rogue: Thief for Mastermind is the best bet I'd say
Sorcerer: I guess we gotta drop Dragon Magic so make it Storm Magic
Warlock: Drop The Fiend for The Genie or The Celestial
Wizard: Drop School of Evocation for War Magic I guess?
I would also add the Artificer to the PHB and add some spells, like the SCAG cantrips, Toll the Dead and some Storm themed powers. Would also include all of Tasha's improvement to the Ranger, the new Fighting Styles and Battlemaster maneuvers.
And, ideally, I would also replace the following:
Trickery Domain for Twilight Domain
Eldtrich Knight for Rune Knight
Way of the Four Elements for the Sun Soul or Astral Self
Replace Assassin with Swashbuckler
Replace Wild Magic for Divine Soul
Drop the Great Old One for Fathomless
And I would cut out two more Wizards for Bladesinger and to have room for the Ranger's Horizon Walker
I think that would give us a more interesting load out of classes.