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The secret is matching cards to your lifestyle and not letting cards drive a behavior. We have an Amex BCP which we max out on grocery, a regular Blue Cash when we are out of 6% BCP grocery, Citi Dc great misc card, Disco love those 5% and Disco deals, DW misc favorite is Cap 1 QS (she has good service that she loves), US Bank Cash plus for utility bills For our Biz we have a Chase Ink and a cap 1 Spark. We have others but these get regular use.
For being new you got a pretty good setup going on, since you already have the amex plat you thought about SPG cards from amex, plat card gives you gold status at spg, Marriott and ritz, since your doubling up if you and wife get both the personal and biz spg the signup bonus on all 4 will be more then enough points for a Marriott nights and flights package, that’s good for 7 nights stay and 120k miles on most airlines, As long as can meet the signup bonus that’s a free nice vacation, If you do go that route make sure you refer each other for the extra pts. And then whatever airlines you fly on go for them next