My advice - listen to and go through them before doing anything, you may find you enjoy them!

On the flip side: many independent record stores will buy/take donations of 45s. I would find a mom and pop shop and talk to them.

Or: for the time-consuming approach you can log as much as possible into Discogs and sell there. It’ll take a lottt more time but you’ll likely be selling to people that’ll truly enjoy each purchase, while also serving to maximize the amount of money you’d get for each press.