Credit card closed due to inactivity

I’m 23 and I got a PNC credit card back in 2020 that I never used , I never even pulled the seal off I just let it sit , Fast forward to today and it was closed I guess due to inactivity and it dropped my credit score from 750 to 734. How long will it take to Recover from this and why did it drop . Credit in general just makes 0 sense to me I’ve never missed any payments on my other Apple Card and my two cars and my score still struggles to go up.