The President of US has no choice but to hand over power to people who stole the election?

You may be right in a way as the constitution left it to the people to correct the wrong with 2A provision.

Also Trump handing over to the Military until a fresh election is conducted by the military is also a viable option that has been done in many other countries i.e recently in Thailand. But I doubt if any adviser even suggested this to Trump.

The President of US has no choice but to hand over power to people who stole the election?

You may be right in a way as the constitution left it to the people to correct the wrong with 2A provision.