That sounds more like one possible trading strategy Which is a very wrong approach in Bitcoin investment. You are apparently saying that you are to buy at low price and sell when price is high and then buy back again when it is low, this may result you being out of the the market for long periods of time, reason being that there is no certainty that you are going to see the expected low price to buy back because the market condition can possibly be in an upward trends for so long and you will be left out not have Bitcoin in your portfolio or you may end up buying higher than your selling point.

For instance, saying that you bought at $45k and sold at $65k and the price then stays between $65k and $70k or more upwards for months or years or forever. That means you will end up not buying or buy at a price higher than your selling point.