I have LT PLT on AA, and because of my AMEX PLT, now have CX G.
Should I try and credit to another program now, so I can have status on multiple airlines?

And, if so, which one?

DL with Skypesos, I can't count on their value being able to last.
UA has way too many elites.
A3 has a good entry rate for *G, but their redemption rates aren't the best.
KE lounge in ICN has been very crowded at times (even more so than an AC MLL in YYZ)