@hebele if you are having pain, there's probably something in your technique, the way you're holding your hands/wrists/arms that is causing you trouble. If you don't get it corrected, it may get worse.
I don't mean to sound alarmist, but that would be my concern.
A service like Entrada is not likely to help you figure out what you're doing wrong.
Perhaps you could find someone who you could meet with once a month? Also, regarding online services, there are two models that might benefit you. One is where you do a live, real-time lesson. This is the best online scenario, because you can get immediate feedback and easily ask questions etc. The other model is where you send in a video and get feedback on it. This is not as good as real-time, but still would get you some feedback that's geared to you specifically.
I highly recommend you pursue one of these options, esp. if you're having pain.