Discuss what you think Louis XVI could have done differently to literally save his own head.?

At the start of his reign, he could have kept out of wars so as not to place France in heavy debt; bankruptcy was what led to the Estates-General being called to vote on tax reform in 1789.

In 1789, he could have let the Estates-General vote by head rather than order, thus making it possible that the reforms France needed were passed. Instead, the three estates voted by order, meaning the nobles and clergy could oppose any move for change by the "Third Estate" in a 2-1 vote. This, and a series of misunderstandings, led to the Third Estate along with liberal nobles and priests to break away and form their own assembly, the National Convention.

In 1790, he could have listened to his allies on the right and accepted his new position as a constitutional monarch with limited powers. Instead, he shot his own side in the foot repeatedly with intransigent demands and a refusal to cooperate. This, coupled with attempts to flee France, increasingly damaged the power of moderates like LaFayette and made it easy to paint him as a tyrant or traitor.

By 1792, he should have chosen to gone into voluntary exile and renounce his throne. The aforementioned damage had built up to make him and his family extremely unpopular in Paris and the actions of foreign powers, such as the Brunswick Declaration (which made it look like the king was working with foreign absolutists; a rumor not helped by Marie-Antoinette's own ties to Austrian sympathizers). With the Storming of the Tuileries on 10th August 1792, the Jacobins and Girondists rose to power, a massive shift to the left for the Revolution. The king and his family was imprisoned by this new regime and it was at this point that he was effectively doomed.