A 49% fall in one day. New 52-week low. Price down circa 33% below the IPO open price back in May 3, 2017. All long-term continuous holders since the first trading day are out of the money.
Solutions:
Don't hold through major earnings announcements.
Max 5 to 10% position size.
Sell when uptrend trailing stop is hit (e.g. circa $2.60 region back in Oct, 2018).
Don't hold or buy when the weekly and monthly trend is still down.