What should be the next step from here?

Only you know the answer to that question. What are your goals? What type of games do you want to make?

Usually, people start making small games or some parts of them, like pong or space invaders. Or they take some template, like FPS, and work from there, adding more stuff and functionality - different projectiles, more guns, grenades, shields, hud, pickups, …

You tell me. There is no good answer to that. It all depends on what you want to do next.
Do you want to change the light color and intensity depending on your distance to it? Control its parameters with UMG? To be able to hold it and use it like a flashlight? To use it as a way to distract a guard? To make a lightshow?

Their goal is not variety. Is only to show you some of the engine capabilities.

The internet is full of learning materials. For example https://www.virtushub.com/game-dev. have vids on several types of games step by step.

So, the question is: what do you want to do?