In general, when it comes to creative works based on Heroes, the more they deviate from the plot of the Campaigns, the more interesting they become. I recommend "Archmage" - it is published in the literary bulletin of Heroes.
Regarding promotion - why not mention that the book is based on Heroes, if it really is? - those who disagree, I recommend reading my previous post. I'm too lazy to talk about the connection between the book and the game for the third or fifth time.
When I was writing the book, I thought that it would be interesting to fans of the game, but it turns out that it is much more interesting to those who are not big fans of Heroes. There is no point in trying to get the attention of those who are engaged in nonsense, just as there is no point in repeating the plot of the Campaigns.
And criticism in the style of "the character's level is not specified here" or "the plot of Heroes is not clearly conveyed" also has nothing to do with writing talent. The main thing is the ability to write and inspiration - if it exists.