Smartest Way to Use Points for Trip to Mexico

Hi all! I’d like some advice on how to make sure I’m smartly using the little points I have for this upcoming trip with some points left in the bank. I have 50K points with CSP, 43K with JetBlue, and 3K with United (total of 96K points).

Travel dates are July 31 - August 8. RT from BOS to PMX (dates are fixed). Solo traveler, economy/+ class. The only airline flying to PMX that accepts my points is United. Currently, an economy+ ticket for my dates is $1550. I don’t mind paying in cash and points. How would you suggest I smartly use my points to pay for more than half the trip and from which partner would you suggest I use the most points from, CSP or JB?