The search for potential small capitalization, you can use the aggregate price sites like coingecko or coinmarketcap. You can use coinmarketcap with the "Trending / Recently Added" function to check the list of new coins added. In order to filter out potential growth currencies, you should set criteria such as.
New to coinmarketcap less than 20 days.
Trading volume is over 1 million USD.
Market capitalization of $ 5-25 million.
Then, you select a list of currencies that meet your criteria.
Sometimes small cap coins are easy to manipulate. Most newly added coins are hyped just to get listed on coinmarket cap. This can be a good way to earn money, however, this coins would not last long if there's no real use case or a working product. In the end, only projects with working product and good partnership remains on the coinmarketcap.