There are cryptocurrencies whose projects are basically startups, because they have platforms for blockchain services and applications.
Take a look in the top coins on the coinmarketcap site and look for projects with more potential to grow.
That's right, trading some trusted and most selling alt coins would be a good way of investing bitcoins because now a days we cannot really find a lot of places for investments as websites turn scam everytime and also in alt coin markets some coins turn scam after some time so trusting every coin would be a bad decision.