Closing my Gold card cause I see no benefit

Hello,

So I have 3 creadit cards, Chase Sapphire, Venture X ( my favorite) and Amex Gold.

I traveled a lot, I went to so many lounges, non of them ever accepted Amex, it’s always Venture X or Chase, I dont do Uber eats and I dont dine out a lot. If there is any benefit to Amex is the x4 points in supermarkets… and Costco is not one of them…. Which rendered the card useless for me, I’m actually losing with the annual fee.

Will it affect my credit score and my application to Amex platinum if I closed it ? Any other way I can make it more beneficial to me ?

Thanks!