Work harder. Make more money if you want to do your own thing. Surely there are professionals in Greece making good money working as employees for others. What are they doing that the lazy uneducated worker is not?
Do more of that and less complaining that you're making 500 euro a month.
Let's simply discuss why people might not always go for the highest paying job they could get.
What most people that aren't doing everything optimally to improve their situation is that they're succumbing to common human logical fallacies.
People don't see that there are jobs that can potentially lead them out of that class of salaries, not because they're lazy but because they're uninformed about these possibilities.
Or they might gauge that the small chance they have to get such a job isn't worth doing something they don't enjoy at all, and would rather survive doing something they find bearable.
For a lot of younger people however, things are even more depressing. A lot of the "lazy uneducated" workers you mentioned spent years getting a university education, up to the PhD level frequently, and they feel they're invested in a thing they might be good at or they might enjoy practicing.
Objectively, they should give it up. Subjectively, I can understand wanting to hold on to a small hope that you might eventually get to do the thing you enjoy doing for a living.
If I'm allowed to be frank I find the characterization "lazy" very offensive, despite not having been in their shoes, because I have countless peers that are in this exact situation.
And all it takes is one(!) bad/uninformed decision in your past: skip STEM.
One of most cirurgic comments I read in HN. It's a pity that is buried in the thread.
As an anecdote, on average, a masonry assistant(!) earns more than an architect (buildings, not IT) where I live.
Not only are you still not upright, but you just ruined your shoes, and have to pay yet another $3 to replace them.