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The ability to play Heroes can be conditionally broken down into several components.
Some of them can be measured in some kind of points, for example:
knowledge of templates; knowledge of heroes (specialization); knowledge of units; tactics (excluding special buildings); strategy; capturing special buildings; turn management; magic; typical skill trees; secondary skills...
Of course, everything is interconnected: the specifics of morale and the effects of magic – and capturing crypts, turn management – and the speed characteristics of units... And when, before defeating champions with the main stack of pikemen, the player starts thinking about an alternative: increasing the number of units or upgrading them – that's a good sign...
There are also other, difficult-to-measure parameters.
For example, physical fitness, moral and volitional qualities, a specific player talent (it's not for nothing that many outstanding Heroes players also perform well in other disciplines, from chess to poker), game intuition, or so-called "instinct," a specific talent for playing Heroes, and a deep understanding of the game...
Why all this?
Try to evaluate yourself according to the parameters that I have tried to provide. For the highest score in knowledge of team templates, you can take Wicc as an example, for the magical arsenal – Dirty Pleer, for combat skills – Alex_R, and so on.
Then, the "weaknesses" that you can try to work on will become clear. Knowledge can be improved with the help of the excellent FizMig, capturing special buildings – through a combination of independent training and studying saves, team templates – through training games and studying the games of Masters...
Good luck and may your skill level increase!