Good luck! As mentioned above, probably the main thing is to get into some movies and get seen: even if you're the only good actor in a bad movie, people will notice if they see it. On the other hand, if it's so bad that no-one will see it, that may be time to find something more useful to do
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Also, at least over here, people working on low-budget movies tend to pick actors they've worked with who they know are competent over actors who just send them a resume and showreel, so once you get into a couple of movies you're likely to find yourself working on more. I don't know if the same applies higher up the scale, but suspect it does.
Oh, one other thing: I was talking to a TV/movie director about showreels some time back and he commented that it's better for an actor to decide what kind of roles they're best at and concentrate on doing those well than to jump from one kind to another. If he's looking for a romantic lead, for example, he wants to see showreels showing people playing romantic lead-type characters and not jumping from action hero to villain to comedy to horror slasher to... whatever. There's too much money invested in the average movie or TV show to take big risks on someone like that, unless they're already an established actor.
If you look at most big movie actors they've tended to play similar kinds of roles in movies until they were well-established enough to convince people to let them do something different. It might be boring to do the same kind of thing for years, but if you get really good at playing an action hero (or whatever) then you're far more likely to get chosen for the next action movie than someone who's played all kinds of other roles.
Lastly, at the end of the day, the way you look is going to determine a lot of the roles you're offered. If you've won 'Mr Universe' you might easily get action hero (or, at least, villain) roles, whereas if you're a 120 lb teenager who's rarely come out of his parents' basement you probably won't
. It's better to concentrate on parts you look right for, because that's what you're most likely to get offered.