Dismemberment
Scholars have said that if one dreams of having their limbs cut off, it may indicate travel and the dispersal of their clan, citing the Quranic verse (And We cut them up into nations on the earth). As for impotence, it may signify that its owner remains protected and ascetic in the world, with no mention or fame. If the impotence ceases, one may attain power and renown.
Per Ibn Sirin's Muntakhab al-Kalam fi Tafsir al-Ahlam