I think that the best way to find small cap altcoins would be through scrolling in
https://coinmarketcap.com/ sort them with the market cap column and then you scroll down and you will small altcoins, I would suggest you to find the altcoins page to see what it is came to offer, and then check it's github page to see if it's active and how many contributers it has.
Not all the small market cap coins that have an intersting video are profitable, it's really matter what's the hype about the project and how the team that develops it is able to set up things straight.