I want to ask you guys, how do you get job in EU?

Hi guys, I am looking for a job in European country with work permit. I have applied already with some EU based company and every time is same answer they declined my resume for no reason. I have 6 years more experience designing and creating SAAS based products, I want mention that I have good experience with doing digital product with strong portfolio also, so I did not get what is reason why they decline my candidature. Do you have guys experience with working work permit is there any issues moving another country and get job there.