I have checked a large number of essays and discovered that students rarely understand the difference between MAY and MIGHT. Most are simply clueless. Let me explain it in as simple words as possible.
MIGHT = possibility of something hypothetical, imaginary.
You might decide to take a bus to downtown and discover that the shops are closed.
I might visit your country next year if I manage to save some money.
There is an element of imagination (something hypothetical) in the above sentences.
MAY = possibility regarding something factual. (not imaginary)
Due to the Coronavirus pandemic, we may face a financial crisis deeper than the great depression of 1929.
The financial crisis is NOT hypothetical or imaginary. It is real and factual.
The doctors have completed the surgery, but he may suffer from another heart attack.