I think the hold period doesn't just go away after the first couple of transactions. Carry on sending your items with tracking in your handling time so that you show Ebay you're building a positive experience for your buyers.

Some platforms have moved to a 90 day review model to ensure that there are no disputes or chargebacks, and this is probably what Ebay has done here.

Buyers hardly leave feedback these days, so that would be one thing that you cannot count on. If I'm lucky I get 1 feedback for every 30 transactions.