What is the ruling on leading people in prayer while praying alone, knowing that a small amount of urine comes out after purification, and adopting Ibn Taymiyyah's view of pardoning a small amount of impurities?

This small amount of urine is excused by the Malikis if it occurs daily, and ablution (istinja') is not obligatory for it. However, it nullifies ablution (wudu') according to all scholars, unless it reaches the extent of سلس ( سلس is a condition of involuntary, continuous discharge). If you pray without wudu', your prayer is invalid. As for not performing istinja' for these drops, it aligns with the Maliki view, and your prayer is valid. Scholars advise purifying oneself from them as a precaution for religious observance.