there might be a lot of reasons for that.
It might be due to physical power cord or motherboard or power supply.
Better to visit and consult some local support shop.
If you want to figure out this on your own, then you have to diagnose the problem, you will have to try different things.
You have to try to Reset your MacBook (follow this decent article on the internet for that https://www.experthoot.com/how-to-reset-macbook-pro/)
You have to try to pull out and pull in the battery(yes you will have to open your MacBook)