Covid is killing cash without a doubt........we hardly use cash at all now.
If you fancy a bit of nerd amusement, there's a guy on You Tube who gets £500 in 50p coins, and searches for the rare ones...................
And the pound coins...............
And two pound coins.................
We've got two sets of the Beatrix Potter one's (50p) collected for the two Grandaughters, I don't think the Grandson is too fussed as there isn't one with a digger on it
Two sets of currency from all the countries we worked in and we always gave our three children and then Grandchildren a full set of proof mint coins from their DOB.
I expect they'll inherit our Krugerrands someday too. always had a soft spot for my Springboks they have served me well

you never go wrong with gold and diamonds long term...