Heyy Deepa!! new year is something to celebrate in your own way!! It all depends on what you prefer!! If you are a person who loves the city life or the rich life go on for indian cities like mumbai
if you prefer the ocean and the beaches then go for goa And if you prefer nature and treks and all , go ahead and choose the mountains like in manali And if you have the budget you can go abroad to Thailand or Bali or Paris!! I hope this helps!! Have a great year!! :))
From my perspective, there are 2 ways to welcome the new year (in India) -
1. Be with the crowd and welcome the new year with a blast - Visit Goa, Delhi or Mumbai
2. Watch the crowd from distance and welcome the new year peacefully under chilly foggy weather- Visit Chikmagalur, Munnar, Manali, Dharamshala, etc. I hope it helps!