You might be able to. The rulers only Goods purchased within 60 days of your departure date and get a vat refund. Your problem is you have an accident entry that is after the purchase of the goods. Worth a try though, would love to hear if it works
That's all depends on the type of business you want to do here. Also on which passport you are using that has an effect on the type of Visa you can get. There are a lot of options and I would need to know more details before I can suggest anything. Send me message if you want to have some more details on what options you have. I run a business that helps people who are looking to start a business in Thailand.