What to do if I have atrial tachycardia and was wondering if I would be able to get a cool adventurous job?

Why not. Atrial tachycardia is common in people. When we get excited, frightened, run or do something strenuous. In most cases it will not interfere with our job related activities if it is mild. If you have another kind of tachycardia, then you need to give us a more definite diagnosis.
Not related. Atrial tachycardia can be easily controlled. A cool adventurous job sounds fabulous. Don't let the one interfere with the other!