Introspection, I reckon; challenging but perhaps therefore the mark of wisdom.
By definition, motivation can't be forced: as with many things, if not all, the central question is "why; where did this [e.g. lack of will] come from?" (and that is one sole question).
EDIT: Also, those friggin' nineties, man...
This post was edited by Danilo_G at April 18, 2018 3:30 PM MDT
Try figure out why you lost your motivation; too much stress involved, not seeming to go anywhere in what you are trying to accomplish, not a favorable environment, etc...
I think Danilo_G's answer has what would work for me, I'd hope - - other than Robbie Williams coming on over to my house to offer me some encouragement. :)
This post was edited by WelbyQuentin at April 19, 2018 4:21 AM MDT