It is ok to invest, without a hidden hope that it will enrich you in a flash. spend some time analysing its course, that'll give you some insights.
How you said it is okay to invest. If you check last three month chart you never say this thought. But proper analysis is important in any investment so we spend some time is good to choose right coin. Already current market is going back recently and know only it is recover slowly so we can analyse the top 10 coin it will guide the further investment. I always support Bitcoin because it will growing well in current traffic and some fluctuation is end again.