Question: how many grabrewards points will you need to qualify as a platinum member?
Answer: Earn more points by climbing the tiers. I.e. If you reach 4,500 points on 14 Mar 2020, you'll become a Platinum member until 31 Dec 2020. If you have 3,000 points on 30 Jun 2020, you'll be a Gold member until 31 Dec 2020.