How can I improve creative focus?

OK, most on this site concluded I couldn't 'engineer' inspiration in a calculated way, so I'll ask a slightly different question. Are there techniques to increase creative focus. When I get involved and focused I feel beautiful things, I see great things I can creat, but I waste most my time filling my brain with bull that is in no way enriching and is an utter waste of time. Is this just natural, because our brains only can feel meaningful stuff for so long and we need other more mundane times or we gravtiate towards bity because we have to have times like that, or am I actively misdriecting my attention, can I adapt how much I am able to concentrate on what meaningful or inpsiring or is it a natrual 'cycle'?