ASW – Alternative hero leveling.

Here is a skill tree scheme from RPE, as an example, showing where you can draw inspiration:



The advantage of this scheme is its standard nature; that is, it is uniform for all factions. Furthermore, almost all branches have a standard structure (3+3+1). There are almost no connections between different branches (with the exception of ultimates). All unique perks are gathered in racial skills.

Added 1 minute ago
(the previous message was accidentally deleted completely, although I only deleted the duplicate post of the scheme, oh well)