Hello, I run a print shop myself and I am not going to tell my clients how they should adjust their screens, because that’s not my job.
There are many graphic tools around on the internet to help you judge the quality of your screen settings, like gray widges and color patches and lots of test photos. Very helpful even if the screen isn’t profiled/calibrated.
Hello, little trick, kind of poor man’s color management. Take a photo that the lab sent you, then adjust your monitor in such a way that the image on your screen resembles the printed copy. Perhaps you can save that as a user setting. Next time you prepare photos for print, first turn on that specific monitor setting.