Blinking Amber MagSafe light usually means Bad Battery or Wrong Charger. === Update (11/9/2020) === Check the wattage of the charger, the device requires a certain wattage, chargers look very alike but you don’t want to power up a 90 watt device with a 70 watt charger, not very long anyway. You have Volts, Amps and Watts check the chargers wattage. k
this could be an overheating problem, have someone with an air compressor blow air both directions through the bottom and side vents, this is good to do at least 2 times a year. Don't run your laptop on a towel or cloth or the bed as this cuts off the air flow, Run laptop only hard flat surface.
if you can get to an air compressor that HAS a water collector on the compressed air side it is possible to blow air backwards through the heat exhaust port (where the hot air usually comes out) as this can 7 out of ten times dislodge dirt and dust bunnies that collect on the cooling fins that we can't see without dissasembly. Be CAREFUL to much pressure can make things worse.