First of all, I would think, if it is really necessary to invest all the sum in the cryptocurrency. probably, the smallest business will bring higher returns than the profit from holding cryptocurrencies.
No idea what you mean by that and what you are trying to point out by small businesses. In fact the small ICOs if you are referring to those have all gone down with their bigger counterparts as soon as the bear market hit. They are no exception to the bleeding out effect of bitcoin.
So the best thing to put your money in would be bitcoin at this moment. Any other shitcoin out there is going to be a waste of time and money. Although you may have some alts being held and not having any worthy price to sell at. All you can do is wait and watch for those. You cannot change those mistaken decisions but you are definitely prevent future ones.