Stage 1 key criteria: contribution outside immediate occupation

Hi,
This is regarding the key criteria for tier 1 exceptional talent which says:
2. Proof of recognition for work outside your immediate occupation
I intend to work upon this area before proceeding with the application and want to create my github/stackoverflow profile and post videos related to my work.
Will it not be considered if I recently do all this just before applying?
How much time should I actively participate to my profile before applying? What number is approximately a significant viewership for a video?

I have helped a couple of startups in setting their cyber security framework. Will a letter from the startups be counted and sufficient to satisfy this key criteria no 2?

i think the letter from the strat up would work and present it inform of mentoring and helping in setting up the security framework

Thanks for your reply.
Are two documents to support a criteria sufficient or we need minimum three?
I am also a cyber security mentor on a mentoring platform online. Can I include the link to my profile in my supporting evidence? I am asking because my public profile on that platform doesnt show since when I am a mentor and how many people I have mentored.

You will be given to attach maximum of 10 documents in support of your personal statement + 3 recommendation letters.
you will be asked which document (out of 10) is showing that you contributed outside immediate occupation, so you just need to mention the name of the document.