What was the biggest jump in pay you've made?

I currently work for a small MSP as a 1099 contractor, but work has more or less dried up the last 2 months to the point that I'm not making ends meet. I've been applying for about a month and after a couple interviews I just received an offer letter for $50k over what I made last year, and I'm kind of flabbergasted. I haven't even started yet and the imposter syndrome is already kicking in.