TRACKPAD NOT CLICKING IN MY MACBOOK PRO LAPTOP

I have MacOS High Sierra Version 10.13.6 (17G65). From the past one month the trackpad is not clicking on my macbook. I am unable to select or copy or drag anything. However the trackpad is responsive of the touch but it is sometimes jumpy and jittery. I have tried all the possible workarounds provided on the internet-

• I don't have a mouse so there is no possibility that the mouse is clicking in the bag
• No Trackpad Firmware update available
• Relevant trackpad settings are on
• I have reset NVRAM and PRAM. The click worked for only 5-10 mins after doing this

Please suggest me what to do to fix this issue. It is very difficult to work in this situation.