Anyone else get serious writers block when working on their pitch deck?

Does anyone get serious writers block when working on their pitch deck? I think the biggest challenge I'm having is my market size and trying to estimate the growth of the markets over the next 4 years. I'm working on a video creation tool so I have to try to understand Youtube/TikTok growth, plus where it will be and how it will change in the next four years. The main thing I need is a reliable source of stats for these and it's like finding a needle in a haystack. Anyone have any good sources for these stats? I want citations for these so that I'm not just pulling numbers out of thin air.