"I illuminate most of the cherry blossom" - I think you answered yourself why you are behind.
As for Strong Medal, you need to use skill trial 20 times. (in breakthrough). It's pretty simple explained.
80% of time, first month matters who will take and keep the lead.
Good luck o/

Find someone who does collect that much, and follow. Yea, it's really hard. Especially when they added few questions out of another anime. I will never understand that.