What card should I get next?

I have 9 cards open rn, not currently working on a SUB, which card should I get next?

I currently have:
1. CSP
2. Venture (can I downgrade within a year of opening?)
3. Freedom flex
4. Cap1 savor
5. Citi custom cash (thinking abt Citi strata premier)
6. Robinhood gold
7. Discover it (can I cancel this and reapply ? I heard you can only have 2 open at a time? I recently found they match cap1 offers as well, not sure how long that will last)
8. Aaa travel
9. Wells Fargo active cash

I’m currently over the 5/24 rule.

Annual salary abt 70k recent grad (bs mech. Engineer), I spend abt \~1k a month live with parents to save on rent. Plan on moving out in 1-2 years to pursue higher education (masters in metallurgical engineering or biomedical engineering).

I am however planning an organizing a mission/volunteering trip to Peru next summer and will be doing most of the purchasing for \~20 people flights/transportation/insurance/material (building community center). Food and housing is cash or free so not counting that, looking at spending abt 15k on that trip.

Was thinking of getting the Amex delta gold for 2026-2027 maximizing the credits and benefits. Flights to Peru fly delta then latam

I am wanting to add usbank connect as well just for the x4 restaurant “lounge” and getting vx in like 3 years when I plan on traveling more.

What do y’all think I should look into getting now or look into next?? For me rh and next summers purchases??