You don’t need to be involved in 35 clubs, or even in 6 clubs. Two or three is great. However, now is the time to up your activity. Now is time to get more involved, taking on more responsibilities, helping plan new activities and expand existing ones, etc.
My kid’s extracurriculars were dance lessons, the school dance troupe, GSA, and unaffiliated political activism. However, the political activism only started during her Junior year.
Looking at your present ECs as well as your plans to expand them, I would say that you’re on the right track. It is pretty normal for high school students to start slowly with ECs, and build up as they get more comfortable, and more senior as members.
College AOs aren’t counting up the number of ECs applicants have and giving higher pints to kids who have a larger number. They are looking at your ECs to see what you did with your time when you weren’t studying or doing homework. There is no different between spending 5 hours a week each on two activities and spending 2 hours a week each on 5 activities. They like seeing that you accomplished something with your time.
They do like seeing concrete accomplishments, and the more impressive the accomplishments are, the better AOs like it. There is also an unfair advantage for activities for which there are competitions and awards (as any parent of a dancer will tell you). However, there is no advantage for quantity over quality, in fact, the opposite is true. Investing a lot of time in a small number of EC is far better than investing little time in many ECs.
If you still feel that you have the time and energy to add another activity, do so by all means. That research project is a great idea, as are your other ideas.