How to get basic sbc’s done without cards

It’s nice to have all these sbc’s but I tried many ways to get players to even complete the 3x84+ sbc and with the way is now, I can only complete 2 or 3, all we get is 15 rare players a day plus whatever reward we can get, I even stopped selling players to be able to complete more. I don’t get why EA can’t see this.