In 2013 there were approximately 24,000 737 flights per day[1] - likely more today. If narrowed to just the MAX variants, it's still thousands per day.
Two, albeit high profile, crashes out of all the daily MAX volume is simply not something to worry about - let alone influence your booking choices.
[1] https://chinaerospace.oss-cn-beijing.aliyuncs.com/18.1%20%E6...