It's late, but it is never too late for a guy throwing 90 with height. You're in the right direction with the travel team. If they're not hitting the WWBA and the other major tournaments this summer, find a team to guest play with - one that is even better.
What you should be doing now is reaching out to schools with the subject line - Joe Smith 6'2 91 mph RHP - and telling them you're interested in their program with some video of you throwing a bullpen with a radar in the frame. Make sure to include the name of travel team and coach name/number in the email.
Have your travel coach reach out to some of the schools you're interested in/he thinks you can play at. Have him let them know where you'll be and when and have him give you the green light to sign up for a specific camp or showcase they'll be at. If your coach can't do this for you, you are not playing for one of the top travel teams in CA.
A few other things - You have good size and good velo. Don't put all your eggs into the velo basket, P5 schools need to see other plus pitches. An inconsistent changeup is not an above average pitch, it is an inconsistent pitch, don't neglect it.