Your lenses likely have decent value if you have any beyond the standard kit option, or you may find a young person who would just be happy to have a camera body at all and pass it on to them. If you happen to know a young mother, I've yet to meet one who didn't want one who didn't want to take 500 pictures of their baby a day (he typed, seeing the notification that his friend has posted 44 new snapchat story updates of her baby in the last two hours). Nikon switched the the Z mount for its mirrorless bodies, but F mount lenses are still in demand since they adapt just fine.
I don't know if India has an equivalent to KEH or MPB but for those of us in North America, they'll usually give you about 20% of the resale price for whatever you send in, but that can be a lot easier than trying to sell $25k worth of equipment yourself sometimes.
I'm somewhat hardcore about keeping at least one body around if I'm doing anything outside daily activity, so my cameras do get used. There have been a few times this has bitten me. I had a bar in New Orleans refuse me entry for even having a camera stowed in a bag, for example, but it's also comically true that if I put a lens with an 82mm filter thread on a body, I get mistaken for a professional photojournalist and allowed to go places I should be able to. I've been doing a lot of street photography this summer, so 16, 24mm, and 28mm "pancake" lenses have been mainstays over the workhorse lenses I usually carry. I have
this stupid little guy here that cost me $60 and shoots at infinite focus at F11. It's made for basically every contemporary mount, so if you have a camera body, it'll work.