As long as you do not have any kind of idea when you will sell, that is actually a good thing. Because if you have a limit you are willing to sell at, then we all know bitcoin could possibly pass that, maybe not today but it could. This means if you say "I will sell when it reaches 1 million dollars each", even though it may take a decade or two in order to reach there, it could still reach it and pass it eventually.
So, it is better to not have any solid number you are willing to sell, so that you could end up with making some profit and saying "this is enough" when you see it. Because, that's how you get rich, you see you are rich enough and you will know it, when it happens, not beforehand.
Changing the description to "Buying fiat with Bitcoin" makes me more hesitant to sell any Bitcoin. Because of course you will want to buy some kind of investment, house, whatever, but buying fiat doesn't seem to make much sense to me.
It's basically a gamble to see if I can then buy more Bitcoin with the same amount of fiat. But added to the difficulty of estimating the top and bottom (and over what period of time really) there are also all the exchange fees and government taxes for selling.
It just seems too cumbersome, to me at least, to temporarily move to fiat in the hopes of making more Bitcoin.