If you'd start trading XRPBTC after the big pump of 2017, this strategy would have been effective for managing the bear market. Seeing that the bear market isn't over, you can likely still follow it and make decent gains.
Enter a trade on a 39 day high/low and close the trade on a 10-day high/low in the opposite direction. Backtest results show a 4x gain since Feb 2018.