I am looking for some business ideas where you necessarily don’t have to invest much also while maintaining your other full time job.

You may want to check with Nepali people in your area who don't have enough money to buy XYZ business but enough experience to run it.  You put some money and partner with them...Share profit.  Both could succeed. In the past, I was offered by one guy who had been working in gas station for years and he wanted to buy a gas station but didn't have enough money...I partnered with him by putting in some amount to help him buy the business. It worked well for both of us. Later, there was a store adjacent to his store, and that closed within a year for some reason. He got the business from that store....It helped to grow his business and helped me too. I still have those shares. He also added another store...Testo type ko deal huna sakyo vanae...it will be great...you must find the right person though...not the lazy or the unethical people...who can screw you later...

Selling some items in Ebay or Amazon might be a good start. Look around your house, what are the things you don't need and are still in good condition. Sell them. Also, you can purchase typical Nepali items from Nepal in wholesale and bring it here and sell individually to make profit.