I don't see the point in increasing the number of skill levels and the number of abilities from 3 to 4 – in general, if we don't take into account the deliberate lengthening of the game, I don't remember ever being able to fill all the free skill and ability slots (personally, I only did this in campaigns, and not even in all of them), and in Multiplayer, even reaching level 25 is a rare occurrence.
Tonight, I will upload the final version of the ability wheels.
The Human special ability is very weak and not impressive enough to be a special ability, but the Guardian Angel is a good thing, but it needs to be strengthened – we need to think about how to do this, taking into account the limitations imposed by our capabilities. In my opinion, we need to somehow extend the effect of the Guardian Angel to all units, and not just one (compare, for example, the power of the special ability of the Dwarves or the Elves – this is what really deserves to be called a special ability).
Chaos – as I said before, it is impossible to tie an element to a race if we are talking not about a school of magic of a specific element, but specifically about magic of destruction and the elements within it.

Added 3 hours 37 minutes later
I have updated the ability wheels on the first page (second message)