it entirely depends on the embassy you apply through as they can have different requirements. Some require a dependent to show the 500K THB other don't. Some want 500K THB per person in the account if it's a join account, other don't. You need to look at the embassy you are applying through and what their requirements are.
Yes, if you stay 180+ you are deemed a tax resident. No one, except maybe an international tax accountant, can answer if you'll pay tax or what you'll pay tax on because it depends entirely on factors like does your country have a tax treaty, your earnings, which country files taxes first and so many other things. Get an account and read the numerous other posts in this group that discuss this.
it's Ellie and she is one of the mods in the other popular but more strictly moderated group. They created the faq pages to use instead of having to answer the same questions over and over again.
if you employer is based abroad you can apply for the DTV Remote Worker category. You need to follow the requirements for the embassy you are applying at and submit those documents. You need to show the equivalent of 500k THB in your personal bank account and some embassies want 3-6 months of bank statements. If you don't have the funds, you could look at the sponsorship route. The funds have to be a liquid asset crypto and investments are not accepted.
Contact the owner of the group, they are an agent and can explain it better then I ever could. My very basic understanding is that for a fee, they meet you at some point prior to immigration and help you go through the process.
If you want to avoid the minibus fly but consider paying an agent to meet you and "help" you through immigration. Talk to the agent owner of this group, they'll have options available.
yeah, there is usually a reason people get declined but it is concerning to hear about it, especially when those that were declined have no real idea what they messed up and just randomly blame the embassy. Using one of the walk in embassies is probably easier since they'll tell you upfront if you need more documents and normally don't charge you till it's issued. Still, it's a risk. Agents charge a lot but if you are really worried about it, then might be worth the costs so you are stress free. Worth pricing it out at least.
What part are you finding "super exhausting"? It's a pretty straight forward and simple process if you qualify and lots of people are willing to answer questions in various groups to assist. If it's too much for you there are agents out there who will arrange it all for you so maybe look into that option.