I think investing in ico is not a good way to increase altcoins or get profits. I think the best way is trading, you can get a big profit from trading, but trading has a big risk and you must have knowledge in trading.
There are two main ways:
- Investing in altcoins, sell highs, buy lows. This approach will help you to increase your total altcoins
- Investing in bitcoin, buy lows, sell at peaks. then using money from bitcoin to buy altcoins when altcoins dumped. That one will help you to increase your total amount of altcoins, too.