Based on weekly chart, it's also possible that USDMXN will go bearish first down to 20 in the next few weeks. But with the Fed hawkish on USD and likelihood of another interest rate this year and anticipation on economic growth, USDMXN can bounce up again and go bullish in the long-run.
But if I get a bullish price action within this week, I'll be setting up a buy stop order with TP near 22 and SL near the current daily support (yellow line).