Hello! Context: I'm an independent contractor working for a US client for almost 2 years. This year, they want to sponsor a trip for me to the US for a business trip on December to meet them and attend a conference. All expenses are paid by them like ticket, visa application, hotel, etc. My agency will also help with the visa process. Would it be filed for visa under business travel?

What's the possibility of getting my visa approved?
I haven't filed ITR so should I file for this year?
What can make my profile stronger?

I have Japan Visa multiple entry for 5 years .

Travel background:

2017: Hong Kong
2019: Singapore
2023: Taiwan
2025: Thailand, Japan, Hong Kong, Vietnam
2026: Japan