The best way to avoid risk is to do some research and see how bitcoin was behaving for the past couple of years. In general, investment is a ways risky, may be you should try to diversify your risk portfolio by investing into something, which will lower your risk onto cryptocurrency.
Dividing our investment is best option if we want to minimizing risk in market. Cryptocurrency market always have high fluctuation and we can lose all our money if we make mistake and if we divide our investment in several coin, we losing on one coin but maybe we can gain profits on others coin