Q.My plant needs some boost
I have the plan in the photo attached which leaves on one of the branches are going down and dying, I am afraid that other branches will be touched. Is there anything I can do to stop that.
Should I cut the sick branch, where should I cut?

Certified GKH Gardening Expert
This appears to be the start of a fungal infection. The best course of action from here will be that the next time you water, you will replace 1/4 of that with peroxide. You should only need to do this once. It will kill off the infection while leaving your plant alone.
This article will give you more information on caring for schefflera: https://www.gardeningknowhow.com/houseplants/schefflera/schefflera-plant-care.htm

I did that a tried again, seems i need another idea for this plant? Any suggestions?