I used to invest in ISO and make a profit. Recently, a lot of coins in which I invested fall down after entering the stock exchange. I do not know what to do about it ...
You can't do anything about it, because now is a bear market. You can start investing in IEO, most likely you can make money.
The formulation of IEO is to make separated from ICO which we think that it might have a better perception towards the market.
But talking about the listing of coins is still the same and it probably the result will also just like of what it happen with ICO. People were so excited to get money from investing either in ICO or IEO which means that once it listed into any exchanges, they'll probably sell it and dump. It is commonly happen right now.