What are the best options for applying for a remote work visa in Thailand, and do I need to provide a tax return?

Hello,

I did some research but not able find correct answers. I have few questions.

I have a remote work agreement and can show bank statements up to 12 months and required balance is already in the account.

1- Which one is better, applying directly on remote works or soft power?

2- If applying for remote works is showing tax return evidence is mandatory?

3- If applying with soft power is easier, Is there any courses that you can recommend for soft power than i can register at least for 1 year?

4- Malaysia, Vietnam, Indonesia as my three options to go and apply at there, which one do you recommend for easier process?

Thank you in advance to all for kind and valuable information.