The best reason to try is not based on the chance of success.
The best reason to try is that it hurts less than doing nothing.
When you’re active, life hurts less. This is the most rational reason I have found, in my 40 years of searching, for getting out of bed in the morning.
Finding motivation is a hard problem for me. The most consistent source I’ve found is the understanding that giving up does not bring relief. It brings hell.