74 Supercoin expiring in an hour. Need to know regarding redeem them

Already have youtube premium through referral for rs 10 for 3 months expiring mid of october. Will the youtube premium coupon using supercoins work on the same account next month. 

Or need to use any other gmail id?

Also let me know the best supercoin offer to redeem on flipkart.

(PS. I dont use mobikwik and i dont have airtel number)