Apply for credit card after 3 months?

I got the AMEX plat and CSR 3 months ago all on the same day. I’ve hit both sign up bonuses recently and I’m looking at the Chase United Club Infinite card next because I’m planning a big trip during winter break and I want to buy my tickets now before prices rise.

My oldest card is CFU at 1 year 7 months and my average card age is 10 months. I’ve been hard pulled 5 times but I only own 4 credit cards. My AMEX credit score is 768; my Chase credit score is 754. Would it be wise to apply now or wait the extra 3 months? Thank you for your time.