How I get out of creative block with my art is I do side work. So that might work for knitting/crochet. Without any expectation, organize your yarn stash, build out or organize your patterns. Research yarn, or comment on knitting/crochet posts on social media. When I do the visual art equivalent of these things I find that inspiration hits and I can't wait to get creating again! Bonus: when inspo hits your systems will be organized and ready for you to get going.