First of all you can not apply for the visa while in Thailand and you have to stay where you applied until a decision on your application is made.
To get all the info you need and to get a good overview of what is required check out dtvquickdotcom. I used their step by step guide and got approved in 4 days for workcation
You really don’t need an agent for it as it’s easy to assemble the documents if you use the step by step guide. Used it and got approved in Sydney in 4 days for workcation.
You are essentially already doing what the workcation requires.
Your company is based in Bulgaria but you live and work for it in the Netherlands.
All you need to do is describe this situation in a cover letter that states that you will be working for your Bulgarian company.
If you need a step by step guide with templates for cover letter remote work agreement and checklist for all the paperwork check out dtvquickdotcom. I used it and it saved me a lot of time and I got approved in 4 days in Sydney.
If you have the right documents and put a little bit of effort into the application you will have a high chance of success. There really is no need for an agent. A step by step guide with checklist and cover letter templates will guide you through it. Check out dtvquickdotcom
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