How do I declare my income when applying for a DTV Soft Power Muay Thai visa in Thailand?

Hello, I need some advice regarding the following.

I am planning to apply for a DTV Soft Power (Muay Thai) visa. I meet all the requirements and have more than sufficient savings; however, I am unsure whether I should also declare income.

How necessary is it to provide detailed or additional financial information when applying for the Muay Thai visa?

I previously applied as a freelancer, and my application was declined on the first attempt. I am currently in Thailand on a visa exemption. I would also like to avoid giving the impression that I am working remotely in Thailand, as this is not the case.

Should I declare only my savings and my status as unemployed, or would it be advisable to also mention that I have some passive income in order to further demonstrate financial sufficiency and self-employment?