Help prevent leaks- Altar with Multiple Menus

[severed]

A few years ago I tried making a custom map with an Altar that could summon every standard melee hero (plus some extras). Theres over 24 heroes total, and I split them up by race. However, I think the triggers I created caused leaks, making the map a little laggy.

What is the best way to do this, without using 5 separate altars for each player? I dont know Jass unfortunately

Theres a video of my map in my signature (Altered Melee BGH)