General progression

The Minecraft progression is very incomplete to me and some others who I've asked and I would like to suggest a slight improvement to the games progression for example I think it would be great if when you kill a boss (Wither, ender dragon, elder guardian, warden) that the general mobs(zombies, skeletons, creeper etc) should get stronger alongside the player or add new variants that can spawn to make the progression harder and if possible make it so netherite will only spawn once the wither has been defeated and so the player doesn't get too weak it would be great if enchantments levels would be raised or new enchants would be unlocked.