Trading is the only way to increase your altcoin. As you can see the market situation right now is on bear. You can sell your altcoins early and start to buyback more on the bottom.
With that, your altcoins can increase in number. Wait for it to bounce back and see it's value rising.
This is a simple method to increase your altcoin via trading. And for investing in ICO or something like that, I really not recommend it.