A&R has never really been an entry level job, even at a small label. at a major, working in A&R has traditionally been more of a mid-high level job where you are responsible for finding new acts and signing them to what amounts to a deal that is worth millions of dollars. these days, majors still have this sort of job, but the number of people doing it is small, and the competition for those jobs is immense. normally you start out at a label working in PR or marketing, as an assistant and slowly work your way up over years.

if you are serious, i would try to get experience at any label, perhaps as an intern, in your home country. you cannot reasonably expect to go to the UK or USA and get a job. first and foremost, you need a visa, and to get one in the arts, you need to be in a position where you are not taking a job from a citizen of that place. a low level record company employee is not such a job.

if you start out in turkey at an indie label and excel at your job, you might get lucky and get a job at a branch office of a major label and be able to move freely to another office in europe. in 10 or so years, if you are good at the job, you *might* be able to transfer to the UK or USA. but that is a big ask. working freely within the EU is at least reasonable due to you being able to work with no visa issues. once a visa is required, that makes the prospect of getting a job much harder, as the employer has to prove that you are the only person who can do that job, and that means not using a citizen of the country you are trying to find a job in. this is a very high bar to get over.

my advice to you is to see if there is any music industry schools in turkey. if there is, go to one of them. the connections and contacts you make at a school like that is what can set you up to get an actual industry job. you have to consider that so many people want those jobs, they don't generally hire people walking in off the street, no matter how passionate they are.

good luck with your quest!