1D&D just needs one spell list.
open to all.
then just have classes/subclasses give spells known/prepared extra from cantrips to level 5. 2 spells per spell level.
reduce the amount of spells known/prepared to 1 spell per caster level from levels 1-11 and then only one extra spell at levels 13,15 and 17.
trying to balance 3 or 5 or 10 separate spell lists is just fools errand.
outside spells, casters would get other defining features:
wizards get rituals and spell mastery,
sorcerers have metamagics,
clerics have divine interventions, channel divinity
druids have wild shape
bards have inspirations/expertise.
warlocks have invocations.
spellcasting subclass spells for example:
Healer;
cantrips; resistance, spare the dying
level 1; cure wounds, healing word
level 2; lesser restoration, healing spirit
level 3; mass healing word, revivify
level 4; Aura of light, death ward
level 5; mass cure wound, raise dead
Necromancer;
cantrips; chill touch, toll the dead
level 1; false life, inflict wounds
level 2; blindness/deafness, ray of enfeeblement
level 3; animate dead, summon undead
level 4; blight, shadow of moil
level 5; dance macabre, enervation
Kineticist;
cantrips; eldritch blast, mage hand
level 1; magic missile, shield
level 2; levitate, kinetic jaunt
level 3; fly, haste
level 4; Mordekainen's faithful hound, Otiluke's resilient sphere
level 5; animate objects, telekinesis
Traveler;
cantrips; guidance, mage hand
level 1; expeditious retreat, longstrider
level 2; misty step, vortex warp
level 3; thunder step, gaseous form
level 4; dimension door, find greater steed
level 5; passwall, teleportation circle
Greenseer;
cantrips; primal savagery, thorn whip
level 1; entangle, fog cloud
level 2; spike growth, pass without trace
level 3; plant growth, summon fey
level 4; guardian of nature, summon elemental
level 5; insect plague, wrath of nature
Pyromancer;
cantrips; firebolt, greenflame blade
level 1; burning hands, hellish rebuke
level 2; scorching ray, heat metal
level 3; fireball, ashardalon's stride
level 4; fireshield(fire), summon elemental(fire)
level 5; immolation, summon draconic spirit(fire)
Mindbender:
cantrips; friends, mind sliver
level 1; charm person, dissonant whispers
level 2; hold person, suggestion
level 3; enemies abound, fear
level 4; charm monster, phantasmal killer
level 5; dominate person, modify memory
Illusionist;
cantrips; message, minor image
level 1; disguise self, silent image
level 2; invisibility, mirror image
level 3; hypnotic patter, major image
level 4; greater invisibility, hallucinatory terrain
level 5; dream, seeming
Defender;
cantrips; bladeward, sword burst
level 1; absorb elements, armor of agathys
level 2; aid, blur
level 3; counterspell, dispel magic
level 4; banishment, freedom of movement
level 5; bigbies hand, dispel good and evil