Apple Watch Series 6 40 mm gps (approximately 2 yrs will will get completed)

Display flickering , no physical damage ,no water inside the watch. All other functions working even no display was there. Apple authorised service Center not able to repair, they have reinstalled software on watch but same issue. Ask me to purchase new watch. I don’t know what to do , should I repair the watch from local service Center or what. Pl. provide solution.

india mumbai.