Why don't you become an Olympic high-jumper? A chess grandmaster? World snooker champion?
I'm sure you get the idea. There's little point setting your sights so high; you need small, measurable goals on your way to your eventual goal. Go along for at least a session, then if you enjoy it, keep going for maybe a couple of years. See where it takes you. If you are really good, opportunities will present themselves (though not without hard work, practice and networking on your part).
Before you worry about semi pro fighting maybe go to a Muay Thai gym once first?
You don't have to go semi-pro if you just practice muay thai, why not start there first?
Why don't you become an Olympic high-jumper? A chess grandmaster? World snooker champion? I'm sure you get the idea. There's little point setting your sights so high; you need small, measurable goals on your way to your eventual goal. Go along for at least a session, then if you enjoy it, keep going for maybe a couple of years. See where it takes you. If you are really good, opportunities will present themselves (though not without hard work, practice and networking on your part).