The price of bitcoin is the most unpredictable thing in this world.Because of its primary characteristics no one can tell what will happen with except rare cases (such may be halvings). It is decentralized (so no one can take care of it to help in achieving the staying in a given level) and is yet child (and is such is "capricious" and do what want; if old and mature will be more restrained and cannot go so fast up and down without any kind of rule). Having those in mind the only thing that can be made (at least that is what I do) is to buy every day on every various period little quantity of it. In this way you will not "feel" the costs and will have always more an more.