Hey Igor, here's a tip: if you release two or more singles in a single month, you'll get significantly less sales per single. In order to avoid that, you should only release once single a month (when the launch button is green instead of orange), maximizing profit and minimizing losses.
Also, concerts aren't really that profitable unless you have a really popular group with dedicated fans who are willing to pay a lot for tickets.
If you keep those two things in mind, and keep doing what you're doing with photoshoots and promotions, you'll be thriving in no time :)