Purpose will keep you going. It’s the only thing that can keep you going. You would be dead otherwise.
There’s a reason why you’re still alive, and a big part of that reason is that you haven’t killed yourself. You haven’t killed yourself because you have a purpose for continuing to live.
That purpose may be unconscious. You may not consciously be thinking about it, but it’s there, driving you, sustaining you, guiding you.
Get familiar with it. Understand it.