>>289215A lot of people usually just kill the extra plants in the pots. What I do is grab the one I want by the leaves, gently pull it out, and stick it in a new pot.
I can't quite tell how big your cups are...looks like they mayyyy be big enough. Here are my ~6 week old peppers for reference. I just noticed they have roots coming out the bottom and need to be potted up. I've got another month before they can go outside...eek.