Also, is there any of you got the EU blue card and found a nicer job in UK or Holland with that after Poland?
If your goal is to work in the UK or Holland or any of the richer countries, apply for jobs there. If you have the qualifications and experience to land a job for 13,000 PLN in Poland, you have what it takes to find a job in a rich country for double or triple the pay, and it doesn't make much sense to use Poland as a "stepping stone" or "back door".
Do your research and apply to as many jobs in richer countries as you can. Network and contact real people, rather than relying on the internet. Good jobs are practically never advertised on the internet. They are advertised by word of mouth, so networking is crucial.