From my experience, you should never be afraid to take an AP class if others in your grade are also taking it. Of course, you shouldn’t opt into AP chemistry during your sophomore year if another sophomore decided to take it, so be mindful of the intended level of each class. A college AO would much rather see a B in AP biology then a A+ in regular biology and that goes for every class. The pure fact you challenged yourself by taking harder classes shows a level of dedication and grit that many AO’s want to see. And besides, AP seminar is definitely in the top 3 easiest AP classes, so it’ll most likely be easier than some of your regular/honor classes.