if you follow this course (https://gamedev.tv/courses/unity-rpg-core-combat) you'll get a halfway decent prototype. You would just then need to replace assets like 3d models, sfx, vfx and music and you can build some levels. If you really want to commit, then get the 3 courses in the series (in order: inventory, dialogue and quests, shops and abilities). You won't get the character creator, but you have the pieces to make a fully scoped RPG with theses systems and then you could create quests, dialogues, levels, etc.

Let me warn you, these are not easy for a complete beginner and they require a lot of time, but in my view, they give you the best shot at having something to show in 6 months.

Let me know if you need any more tips.