Given your goal of transitioning from a part-time lifeguard to a full-time head lifeguard, your personal learning goal should encompass gaining the skills and qualifications necessary for that position. Among the options provided, the most relevant choice is:
Earning your lifeguard license.
This goal is essential because a lifeguard license certifies you to perform lifeguarding tasks professionally and often is a prerequisite for becoming a head lifeguard. Furthermore, it typically includes training in CPR and first aid, which are important skills for a lifeguard. Therefore, focusing on earning your lifeguard license aligns perfectly with your aspiration to become a head lifeguard and manage your own crew.