You are pretty much in a decent place for a sophomore. At that end of her first semester of sophomore year, my kid’s GPA was about the same as yours, her ECs were her dance and co-leadership of a failing club. No awards or honors to speak of.
By the first semester of Senior year, the club was thriving enough to require a third official leader, she was an unofficial leader in her dance company, had a good set of awards and honors, and was competing for a major merit/leadership scholarship for which she had been nominated by her high school. Oh, and her GPA was higher, too.
She is now a first year at an excellent college on a full tuition scholarship.
You have a very good GPA, and have a solid EC record for a first semester sophomore. As others have written - sophomores rarely have leadership positions, nor are they expected to have such.
If you feel that you have the time and energy to add a third EC onto your activity list, do so by all means.
Something important to know is that, when colleges ask for “leadership”, they do not mean “leadership positions”. Leadership positions are no more than titles. Being a leader means investing in the club, taking on tasks and missions without being asked, helping others work towards common goals, etc. Being a leader takes time, and, at the end of the first semester of sophomore year, you aren’t expected to already be at that stage.
Invest energy and emotion in activities which interest you, and you will become a leader. Establishing a club so that you will have the title of “president” will not demonstrate leadership. In your resume, you need to also summarize what you did, and “president and founder of Stamp Club. met once a week and discussed stamps with other members” is not something that demonstrates leadership to anybody. However joining a club and becoming one of the most active members. who brings positive change to the club does demonstrate leadership, whether have the title of president or not.
The only reason to establish a club, as @Groundwork2022 wrote, is if you believe that it is needed, and one doesn’t exist. Otherwise, join a club which interests you and make yourself the best member of the club that you can. If you do, you will become a leader, whether you have a leadership position, or not.