Giving Vinicius his best performance would be the best thing for him to show to all the fans. There is no need for any way to repay such a thing except with the best performance that can be shown. I hope Vinicius will appear in the best condition and score goals.
The award issue is over, indeed some fans think it is unfair. But Vinicius must focus on playing and giving his best to bring Madrid to victory. He is a great player and he must show his ability.
Guardiola said that he doesn't understand what happened in the match with Arsenal and why they conceded so many goals at the end of the match, but if you remember the matches between Real and Barcelona, they also went through the same. And City have been playing better in recent matches and it even seemed that they got out of this crisis and are ready to move on. Maybe I would give a slight advantage to Real in this confrontation, but I think that City will not give them the victory so easily either.