UPS stock has fallen over 30% on the year. What should investors do?When you think of United Postal Service (UPS 1.41%), you might think of brown trucks, brown packages, or the old advertising slogan, "What can Brown do for you?"But for those who have been invested in UPS stock over the last year, the one thing on their mind is likely the downward spiral this logistics giant has failed to get out of.Since the start of the year, UPS has fallen about 31%. It has also fallen over 60% from its pandemic-era high ...