A fast 50mm prime on a full-frame camera gives a knowledgeable photographer a lot of options. But "knowledge" is the operating word. It also means that the subject matter of this photographer lends itself to be framed by a 50mm lens. So the fact that a photographer you know is successfully using this lens may or may not be relevant to your situation.
Given that you are just starting to explore photography, you need to build up your knowledge base before upgrading equipment - for example, how to consistently nail the focus, how to ensure that the light comliments your subject, how to frame the image to keep the foreground and/or background from distracting from your subject, how to compose the subject to make for a pleasing image... All of this can be done with the equipment you currently have. The next round of improvement would be the purchase of one or more speedlights (and modifiers), to give you the ability to control your light better. In practice, almost no image is customer-ready without some post-processing, so investing in a good photo-editing program (and then learning to use it), will allow you to deliver the maximum potential of your equipment.
If you are doing all that, and you are still running into equipment limitations, then by all means consider an upgrade. But if you look at the images posted by good photographers, you will find that often they are getting stellar results from consumer-level bodies and glass. You also will see people with superb equipment, posting images that are nice snapshots. The difference is knowledge.