With the remaster having buffed other casters like clerics and sorcerers, and the wizard's flexibility being reduced due to the removal of schools of magic in favor of curriculums, wizards have indeed fallen behind. I don't think the class needs major changes, but improving the curriculums and theses available could be enough.
The design philosophy of the wizard is to be the "master of spells", so I think their focus spells should reflect this by empowering or altering the spells they cast, similar to spellshape feats, rather than being weak filler spells like Force Bolt or Hand of the Apprentice. Here’s an example focus spell:
Empower Spell - 1 action - Spellshape
Increase the spell DC of the next spell you cast by +1 against a single target of the spell.
Heightened (+2 at level 6)
This is akin to the new Ancestral Memories sorcerer focus spell, improving the likelihood of landing a key spell. As the master of spellcasting, this would also draw a parallel with the fighter, being the master of weapons, who gains a permanent +2 to hit. With Extend Spell being removed from the sorcerer's imperial bloodline, it could be given to wizards as an advanced curriculum focus spell. Other changes in the same direction could include making the Fortify Summoning focus spell of the School of the Boundary a free action, allowing it to be used in the same round as a summoning spell (being three actions), serving as an enhancement of the spell.
I also agree with the sentiment that spells taught as part of a curriculum should not include spells that scale poorly unless heightened (e.g. Force Barrage). Instead, they should have spells that remain relevant (e.g. Grease). This prevents those slots from becoming dead as you level up.
Another way to bring the class in line with other casters is by giving something to the wizard chassis that helps solidify its identity. My suggestion there would to make Spellbook Prodigy a baseline class feature. Currently, most wizards feel obligated to take this feat to build their spellbook effectively just to keep up with clerics and druids. This change would enhance the wizard's versatility against the sorcerer's raw power (with Dangerous Sorcery becoming baseline) and provide more build flexibility (by opening up selection of other level 1/2 feats).
Lastly, it has been suggested to make the Spell Substitution thesis a baseline class feature, but I would argue against this because it would likely be too strong, and would further reduce wizard build variability as everyone would go Spell Blending or Staff Nexus instead. This does point to the Improved Familiar Attunement and Experimental Spellshaping being too weak, though. My suggestion there would be to buff Improved Familiar Attunement by letting it provide the Familiar Conduit feat. This would differentiate the wizard from the witch, which currently just does familiars better in every way, and give wizards a fun new way to cast spells. With focus spells altering/enhancing experimental spellshaping, the Experimental Spellshaping thesis could play into this by providing extra bonuses when a spellshape focus spell is cast, making it more interesting than just giving a bunch of spellshape feats.