Heroes VII

The fourth installment broke the boundaries established by the series, which is why it failed. Even so, it still found its fans. Of course, many more people will flock to see another clone of the third game; who would argue? The most important thing in this business is to make as much money as possible.

Nowadays, there are many turn-based games. You can simply take interesting elements from each one (including games within the series) and combine them within certain frameworks, without straying too far from the series. And if there is a desire for something completely different, let it be something similar to the fourth game, but with a different name (not "Heroes").
I played the third game a lot until I tried the fifth. After that, I only returned to the third to test the Hota mod, and even then, not for long.