One other idea if you're into longer term investing is buy a smaller amount regularly, for example every couple weeks or month or so. This might spread out profits but it also spreads out risk - you can't predict where the market will go so it evens out over a longer period.

The trend for cryptocurrencies so far has been generally upward despite the wild swings and they're still a very new technology so nobody knows where it's really headed yet. Of course there's still possibility of a major crash but that remains to be seen for the time being.

Standard disclaimer: the above is not investment advice, it is me speculating on investment strategy. Please do your own research before committing your money :)