Respuesta a "How long does the SSD last?"Well under normal use i think it can last for more than 3 years or so on. Modern day SSDs are very reliable and they come with good endurance.
Respuesta a "cracked touch screen,unresponsive to touch, display without damage"Well my advice it and do not do it yourself. Go to your service center and get it replaced. In future use a good quality tempered glass screen protector having 9H hardness rating for protection.