My Lead Gen Enquries have Dried-up

My lead gen enquiries seem to have stalled in January despite my SEO rankings drastically improving (I'm in the personal development niche, based in the UK). It's got me scratching my head. The last enquiry came in on 4th Jan. I haven't made any changes to my customer journey/conversion-related pages. Is this normal? How's lead gen going for you guys across your sites?