i know how you feel, i had some kinda crisis of motivation/purpose earlier in the summer. had just finished a singles league session and essentially bogarted my way out of a money spot the final 3 weeks. you'd think i'd be fired up to redeem myself but noooooo, i found it hard to practice. as in i'd rather watch Big Brother than go down to the basement unmotivated.
i decided to re-read a golf-centric sports psychology book that i hadn't touched in 10 years. and, it wasn't the words contained therein that brought me back around. well, yeah, the words did make sense and about 25% mildly resonated with me. i'd say maybe 5-7% of the content was directly appropriate. i can remember maybe only 3 or 4 of the thoughts today, 3 months later (but i do now repeat them to myself every time).
but what i think really worked for me was.... the act of going through the whole thing, and listening to someone else's words. i wasn't fake reading (like a school assignment) and i wasn't going all hallelujah i'm reborn either. some parts i'd scream BS, some parts i'd yawn, some parts i'd say oh yeah.
but surrendering control (ie the steering wheel) of the dialogue in my head for a few days was the dynamic that enabled me to put the past well into the rear view mirror and essentially start again. maybe it could've been a novel or a biography instead. but the key was to fill my head with someone else's voice for a few days. so i guess my advice is to get your read on. i'm lucky that my local library is a good one.