If you apply for immigration status and are rejected, sure you can apply for immigration again if you gain much better qualifications. I haven’t seen many successful examples though.

People are deemed to have immigration intent for small things like they don’t have enough ties to their country of residence. An application for immigration is definite proof you had intent to immigrate. You can wait like ten years, but time doesn’t work in your favor (immigration gets harder every year, people get older and handcuffed elsewhere…).