What are some things I can do as a highschool senior now to ensure a smooth road map toward becoming a therapist?

Hello, I am a highschool senior looking to become a future therapist.
Currently, I have no achievements. no jobs or volunteering feats that would otherwise look great on a resume. I am thinking of joining a club at my school where there are opportunities to volunteer at my local elementary school or daycare. I am also considering getting certified for babysitting as I feel working with children would help me hone in on patience and responsibility. My GPA is at a solid 3.0, and the only class I've taken relevant to support this career path is Psychology. I am not sure what to do to ensure success. Any advice would be appreciated!