Felixjuso

So I'm a rising sophomore in my university and have been doing research for a year now. I joined my first lab in my first semester as a part of a program but didn't like the topic that much and joined a different lab that does research on topics I am interested in at the beginning of my second semester. Since the program I was in with the first lab required me to do research for at least a year, I couldn't quit that lab. Now I can quit it and focus on my other research but I may publish a paper with my first PI this year. I am not really interested in the topic but I don't want to waste all the effort I've put into this research and lose the opportunity to get a publication out of it. I want to apply to grad school as well and professors I want to work with are in really top universities so I don't want this to hurt me in my grad school application. I will also continue on with my other research this year so I am a bit scared that I won't be able to handle both and higher level classes.(I think I handled them both with my classes well last year but this year's classes will be harder than last year's probably.) What should I do? Should I quit it considering my grad school ambitions?