Q.Wintering a hisbiscus inside my house
It was doing well until just lately. A large number of leaves have wilted,
some start with a brownish edge and then completely turn brown.
Please help me!

This may be a good time to prune your Hibiscus and get it ready for the warmer temps of spring and summer.
Make sure you are not overwatering and that your plant is getting a nice sunny location.
Here are some links with more information.
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/tips-for-pruning-hibiscus-plants-when-to-prune-hibiscus.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/wintering-hibiscus-indoors-winter-care-for-hibiscus.htm
https://www.gardeningknowhow.com/ornamental/flowers/hibiscus/answers-to-what-causes-hibiscus-leaves-turning-yellow.htm