What should I include in my 5-year plan for my Thai visa application?

Hi all!

I just received an update on my application asking me for further documents:

"Since application would get 5 years-visa, please provide the letter of explanation of your plan/ project for the next 5 years in Thailand"

I'm applying from Belgium under soft power (thai cuisine).

I already wrote a cover letter explaining my plans during the 12-month course (which was merged with my bank statements- maybe they haven't seen it?). I'm a professional chef wanting to master Thai cuisine, its cultural background etc.

Seems a bit too much to say I'm going to apply for four other 12-month cooking classes...

I was planning on saying I'd like to explore all regions and thus, need more than one year to learn all regional dishes... Which is true btw.

They don't seem to be asking how I'll sustain myself..

Any thoughts?

Thank you, this group has already been very helpful!!!