@s7habo can you get a new 27" NEC or EIZO for 1200Euro where you live? From prices in poland I guess that entry is around 1500 Euro.
Do you have or can borrow at least X-Rite i1Display Pro? Alternatively do you have a service which can calibrate the monitor for you? (Spyder’s are to inaccurate for photographic monitors)
Do you have your working place properly lid with light sources that are sufficient for working with colors?
You need to keep your monitor calibrated and check it from time to time and you need to work in defined and established conditions to get predictable results. This is why I asked about calibrator and lighting. The monitor itself is not enough.
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