I think thats really great advice.
To help myself maintain creativity and excitement I take a few different approaches to music. I find it helps to completely switch genres you listen to every once in a while to keep your brain thinking differently. Hendrix Band of Gypsies to Kurt Rosenwinkel, to John Williams (film score composer), to Tom Petty to Bob Dylan, to Mos Def to Robert Glasper to Allan Holdsworth to Tony Bennett to Foo Fighters and even The Darkness (yes I said it! haha). Switch the instruments you listen to - great guitarists but also great sax, piano, flute, drums, bass, vocalists etc. IF you have access to other instruments play them even if its only by yourself at home, even if you have no idea how to do it - just make sound on it and be creative. I left out - also check out great bluegrass, gospel, and indian music as well. Check out tuvan throat singing! Check out some didjeridoo music.
Its basically like eating. You have to have a balanced diet and exercise to be healthy. Same goes for music. Basically you should have an artist you enjoy in every genre. Rock, Blues, Jazz, Classical, Rap, Metal, Country, Gospel, Bluegrass...................and all of those have sub genres obviously to go from.
I think all of us have a love for sound in general precedes a love for music.
With that being said I think you have to look for inspiration externally AND internally equally. I have to come up with some new material to feature tomorrow and I thought I would spend the day trying to listen to a wide variety to get inspiration, but instead I turned everything off and just sat at the kitchen table with my guitar and played. You'll be surprised what comes out of thin air. Experiment. Dont be afraid to make something thats not normally what you'd make. As musicians we all have to spend time learning how to clear our head and tune in to the inside if that makes sense. It will be stronger some days then others, but just keep chipping away and enjoy the process.