Steps 9 & 10 of Precious Path Research are unlocked with Valentine’s event

Step 9 has a Trade task (why is Niantic forcing them on us recently?)

Step 10 has a 5-day time gate

At this point, assuming there’s no pot of gold or at least somewhat-decent reward at the end of this tedious season-long research (like Dual Destinies), it’s probably not worth the time & effort to finish it.