Pin DMs

I've seen a few suggestions with this same idea, but still no implementation. For someone who gets a lot of DMs from random people, something that allows them to pin specific DMs from important people would be a game changer, and such a simple but effective quality of life update. I don't want to steal images/concepts from users who have already posted, but it's pretty easy to imagine what it would be like, just pinning a DM and it would stay at the top of your DM list.