Just wait till you find that you've enough profit then convert it into your currency then buy again when price get low again rinse and repeat.
That will be a too long process. Rather than that start trading with a small amount. When you turn it into fiat there will be a fee, although now fees are there even on transactions. But that will be a more profitable thing to grow your BTC.
Yeah making profits from buying and selling bitcoins will take a long time to grow your coins better option would be to put that money in altcoin trading and start making small profits and eventually it will help you in growing your coins in long term.