the main question is that Is it risky to invest in new crypto coins/tokens? or it is good for a very certain time of investment?
Not really risky, the only risk is not researching enough for the projects that you are going to invest in, there are some projects that have potential in the market, some are still in their crowdfunding stage but yet doing great already in the market, the technology is still young and welcome many players on it, just do your research.