Hop on to https://app.cauldron.quest/

Create a wallet, import, or use wallet connect, using the built in wallet is the fastest and smoothest

Buy $20 MUSD with your BCH, take note of how much BCH it cost

in this case: (Swap -0.04786695 BCH +20.00 MUSD)

Come back when BCH price is down and sell the $20 MUSD back for BCH

Congratulations, you have just earned a BCH profit! 💸

If the price of BCH goes up then buy more MUSD and wait to sell it later once BCH price goes down