Europe Started a new job in a dream company and I hate it. What to do?

TLDR: I got a new job in Finance after I quit my previous one. Amazing company on paper but I hate my job/company. What should I do now, quit ASAP or stay here to write some experience on cv and get a promotion?

I worked in a small finthec company for 2.5 year. Job was more technical than finance and without any real opportunity for development. I was based in a cheap location (think Poland, Slovakia, etc.) and the salary was good enough compare to national average but bad compare to countries abroad. When I decided to quit I apply to several jobs with no luck, I think mainly because of the location of my previous company and the fact that being smaller is basically unknowned.

After lot of networking, I was able to find a dream job. The job in itself is not amazing but is a big company in Finance. When I received the offer I accepted it also if it was for less money than my previous job and just for an analyst position. I thought it was worth to make a sacrifice because of future opportunities.  I had to change country to start this new job. I am still based in a cheap country with a low salary compared to Europe.

I started just one month ago but I hate my job. I realized that the opportunities in my current companies are not good, it is impossible to move to better countries and I am not learning as much as I want. I was thinking about talk about this with my manager but I think there are too many issues for it to be solved so I am thinking about changing job again.

Now, my question: what should I do in my situation? I want to find a job in Finance in a country with high salary and I don't care about much else to be honest. Do you think I should suck for 1 year in my current job to then have a promotion and apply as an associate+ more experience or I should already start applying now and be honest with the interviewer about the fact that I don't like the position and I prefer to change right now instead of wait?

Thanks for your suggest,

Paul