Internals

A player's result reflects their skill/ability. My personal result is important to me: my result divided by the result of the winner, whoever they may be.

If this is really the case, then try playing the maps that were used in offline Tournaments, where people showed a real masterclass in the game (both on the map and in battles)...
and improve on maps that are truly suitable for that...
and no one wants to constantly restart and beat a stupid AI - and this is not surprising at all..
here are two zip archives with screenshots and final saves
the first one is for 11 days - with the book of air, the second one is for 8 days - with the power of the dragon father, and with wings, you can easily manage it in 4 days, but it was just too lazy to restart them....
skill/ability is not about beating a stupid AI by 200% and making 100500 restarts to get an uber-artifact and then pass everything with the 1st fake, but about passing one primitive map in a minimum number of days... this is a real opportunity for a player to optimally complete any map..
And if the result is really important to you, as an indicator of ability, then play more thoughtful and complex maps (you can take some of them from the lists and selections of the best Heroes 3 and KS maps, I sent you a message with a list of individual maps from this list) - there will be more interest, pleasure and benefit from the game, and regarding the time - there are saves and you can always continue the game the next day.