Why don’t you participate in the portal’s tournaments?

In my opinion, the last thing a newcomer should worry about is being suspected of cheating. Of course, this is only true if they are playing fairly. I remember being worried about my performance in my first tournament, but the difference between my modest achievement and the leader's result was so impressive (and Dmitry AS amazed all the participants at the time) that it became clear: I still had a lot to learn.
And there's always a reason to participate in a tournament for fans of Heroes. Even if you don't achieve significant results in the tournament standings, your gameplay will still improve. At the very least, you'll be able to easily handle any number of computer opponents on any standard map and at the highest difficulty.