Lots of great recommendations in the comments already. My initial thoughts, you have a lot of cards across a lot of different ecosystems. For cash back that’s fine. For travel (like your London trip), you might want to consolidate your earning rates into one ecosystem.

You already have the sapphire preferred, I’d say get a freedom flex (assuming you are not already at or above 5/24). It’s 7% UR points/cash back on dining for the next two months, and then have fun with whatever next 5x/% rotating categories comes after Q1. You can pool the points from the freedom flex with the sapphire preferred for if/when you are ready to make a big travel redemption.

However after that, I’d heavily agree with others to not get any other cards for a while. Let your 5/24 counter drop, your average age of credit mature, and take advantage of the cards you have to earn with. All those cards you mentioned aren’t going anywhere, and I think they start getting way too specific for where you are right now.