Live goals could have more variety of goals rather than "do your best and you'll complete the goal!" For example :

Finish a live with max combo of 150 - 200

Play a live with Rimi in your team

Send sticker "fuee.." 15 times

Get 30 perfect notes continuously while a skill is active

Have at least 2000 health

Get 50 - 60 great note at the end of the live

Catch Moca near Yamabuki bakery

Of course these goal could be adjusted for more difficulty as well.