To get to Level 4 on TCGplayer, "you need to have 51 orders reach their destination by their EDD, and have a 90% or better positive feedback ratio."
Source: https://seller.tcgplayer.com/articles/how-to-get-to-level-4-asap/
The fastest way to get to Level 4 is to have 51 orders as fast as possible.
This is the master pay it forward thread. If you are Level 1, Level 2, or Level 3 on TCGplayer, post a link to your TCGplayer listings for your fellow Poké Collab members to see. That way, we can support you by buying from your store instead of random strangers on the Internet.
Note: please do not post in this thread if you have already reached Level 4. Only one post allowed in this thread per member. Once you have reached Level 4, please update your message to let the Poké Collab community know about your achievement.