I say, and with God's success: It is disliked to entertain oneself and waste time without any worldly or otherworldly benefit. Watching series is disliked even if they do not contain extravagance, immorality, or temptation, due to the waste of life without benefit. A Muslim should turn to God Almighty with remembrance, the Quran, prayer, worship, and doing everything that brings them closer to God Almighty, and they may exceed in what is necessary. And God knows best.