If you like RPG Maker, keep using RPG Maker.
If you want to branch out, outside of the types of games that RPG Maker is known for, finish up this project, and then try a different engine out and see how you feel. If you want to make that style of RPG forever, stick with RPG Maker, and just learn enough tricks to tweak it and make it more unique, e.g. make your own art assets (or buy them) and learn how to make the game looks and feel less like a default RPG Maker experience.
RPG Maker is awesome because it is simple. If you hop over to the Unity, Godot and Unreal engines, they get really complicated really fast. You can absolutely learn them, but the initial learning curve is steep compared to RPG Maker.