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Let's call a spade a spade: not everyone can win a Tournament, most people still have a lot to learn, and simply participating isn't considered a particularly prestigious activity for many, but engaging in casual banter is always honorable. Potential participants need to be encouraged by creating an atmosphere where a lack of Tournament activity is seen as an indicator of a certain inadequacy on the portal. This is a hero-focused resource, not a chat room.
This kind of incentive is completely absent; medals don't help, because only a few people receive them, and those are the ones who are already playing. The idea of "Grails" has long been abandoned and rests in peace; no other ideas have even emerged.
The biggest enemy of Tournaments is laziness. You read the discussions, and it seems like everyone is playing more or less regularly, but they don't have time for Tournaments. Of course, there's a risk of losing, and you definitely have to use your brain. It's hard work. But here, you load the game, beat the AI, and you're happy. This laziness can only be combated with appropriate conditions on the portal. If I really have very little free time, then outside of Tournaments, I only occasionally play the fifth game; I haven't played the other parts for many months.