I want to upgrade from an existing Appsumo Tier 2 to Tier 3

I have two questions.

1/ I want to upgrade to Tier 3, how do I do that, do I just purchase another Single?

2/ I purchased Tier 1 on Mon, Apr 10, 2023 then upgraded to Tier 2 Oct 17, 2023, however, my account says it is now back down to Tier 1. At some point, I was downgraded.

I really want to get to a Tier 3 before this sale ends. I may want to upgrade from 2 to 5 as well if you can tell me what i need to do for both upgrades from 2 and what we need to do to get my current status fixed. Thank you