Know that relative to previous events it is possible for a much larger drop. Be mentally prepared. Stick to your plan. If buy and hold is your plan you should a

Know that relative to previous events it is possible for a much larger drop. Be mentally prepared. Stick to your plan. If buy and hold is your plan you should already know that it routinely has 30% drops for months or years at a time. If you have all your money in one company stock then your plan could use some diversification.