I've recently contacted Reddit support in order to prepare my ten year old account for deletion. Although all official sources say, that they don't offer refunds for Premium, I tried to get at least a part of the 50$ (yearly membership; last renewal in Feb 2023) back. To my surprise, they've actually refunded me the full amount.

Three things which might be important:

1. I'm from the EU, so maybe this only works in countries/states with strong consumer protection laws; their response came from their legal support team
2. I used the recently announced discontinuation of awards and coins as reason for my refund; they advertised monthly coins as a Premium feature back when I started my subscription, so not delivering them anymore might be false advertising (IANAL)
3. I've bought Premium using a browser; I don't know if refunds are handled differently when it has been bought via Google Play or the App Store

So if you want to delete your account, due to the ongoing enshittification, and have an active Premium subscription, you might want to try to get your money back. Despite Reddit's official stance.