Many high-flying tech-focused enterprises that benefited tremendously from the coronavirus pandemic have since fallen back to Earth. Block (SQ 3.60%) is a great example. Even more discouraging, shares have lost money in the last five years, which is extremely discouraging. For investors with a long-term mindset, this performance just means now is a good time to reassess the company's situation in terms of its long-term potential. Should investors buy, sell, or hold this fintech stock? Block management is fo ...