maybe I will choose the two ways that you have mentioned to increase the altcoin that I have, namely by trading and holding for a long period of time on some potential altcoin that I have, because both of these ways are of course more able to minimize the risk of loss than having to invest in ICO which is not fully trusted.
trading can increase the amount of the token, while holding can increase the amount of the price. by far, it is indeed the best way to avoid great risks. working on several bounty projects also looks pretty good, especially if it's a pretty good IEO project, and works with popular exchangers.
investment is also used as a way to increase the altcoin we have. however, at this time the method was quite risky because until now there were quite a lot of projects that found dead ends, and fraud.