One of the often suggested changes to height bonuses would be to instead of advantage offer a +2 to hit below you. This mimics an inverted version of the cover mechanics of the book (half cover gives +2 AC, three quarters cover gives +5) while simulating that height gives you a greater overlook of the battlefield.
One could either remove disadvantage from low ground entirely or give the target-on-high the half-cover +2 AC bonus too.
This also has the added benefit of reducing the impact of "locational advantage" on gameplay -- a Rogue would for example not get automatic sneak attack for being above the enemy from constant advantage but need to have an ally next to the target -- and improve the utility of advantage-granting abilities and spells, similarly to how removing Backstab Advantage from the game made the combat more versatile and fun.
Also hello forumites, it's been a while. Good to see you again.
