Persistent insomnia can have multiple causes, such as stress, anxiety or disturbed sleep habits, and medicines alone may not always be enough. Try to follow a regular sleep routine, avoid screen use before bedtime and keep your room calm and comfortable. Limit caffeine and heavy meals in the evening and engage in relaxing activities before sleep. Avoid taking or changing medicines on your own. Consult your doctor again to review your treatment and consider other approaches for better sleep.