After a long time using the Razer forum, I only now discovered that trophies can be converted to Razer Silver.
As a non assiduous user of the forum (since it doesn't have a friendly interface), I received several trophies, but I went to the message and it only showed me that I received the trophy. Along with the message comes a link with the name of the trophy. When opening this link I am directed to a new page informing the reason why I won this trophy.
By chance, today I went to the REWARDS tab, and it was only there that I saw that you have the option to convert your trophies into Razer Silver.
I imagine many people like me may have missed the deadlines to claim the rewards for this complicated interface.
I suggest that when the person receives the trophy have a more friendly link for the person to be able to redeem the reward.