This operation to Nepal voltage pot as an example:
First, not completely pressure relief, patiently wait for the complete pressure relief.
Secondly, the lid of the electric pressure cooker has a rubber ring pad, you can check if the leather pad is placed neatly.
Thirdly, check that the edges of the lid are not squeezed out of shape.
Fourth, check for foreign objects in the grooves under the cover.
Fifth, over time, although the pressure drops to normal atmospheric pressure, there is increased resistance between the safety valve and the lid (oil, food residue, and oxides), so it does not naturally drop to a position that allows the lid to open properly. For this reason, you can poke the safety valve with the tip of a chopstick, but be careful to clean the debris between the safety valve and the lid in a timely manner after use so that you don't repeat the mistake next time.