[oshirisuki]

get as bored as you possibly can, put yourself in a situation where your only alternative to boredom is doing something that you think you can only do with motivation, figure out what that is, and then don't allow yourself to do anything but that, so if you're not doing that, you should literally look at paint dry, or be in an empty room (completely empty, no bed, no chair, possibly, no lights)

you can "nudge" instead of going cold turkey, set your phone to grayscale, turn notifications off, close social media accounts (or at least uninstall apps), stop binging tv shows (if you do), or watching tv, you probably get the gist of it, make it so that what to you now requires motivation, is the fun option