Short Answer:
To come up with new games ideas, you can:
- Find inspiration
- Find the genre of games you like
- Think of what games you and people would like to play
- Think of details (Find the setting, environment, components, etc)
- Try combining ideas.
You also need to find the purpose of the game, mechanics, rules, etc, before you start creating a game, I don’t suggest rushing. What I suggest is to take time thinking until you find an idea.
Long Answer:
This is only a contribution to helping you come up with a game idea. Finding an idea can sometimes be hard if you don’t know how to think of one. To think of an idea, you first need to find the genre of the game, the genre you like and what players would like to play, the genre is a category. The next thing you would do is to think of what game you would make. You can try combining ideas or genres that you made. (Example: FPS Survival Game). When you find the genre you’ll like to choose, Before going into details of the game, Ask or just think if players would play your game (Or you can do this after finding the details of the game).
Now going into details, If you don’t know what details or what it means, it’s the setting, environment, the genre, etc. A setting is what time it has occurred. Now, The Past, Future, other time. An environment is where will it be (Example: House, Forest, City, Space, etc.). It’s not really that necessary to think of it yet. Anyway, when you’re done, find the purpose of the game, mechanics, and rules. The purpose of the game is the goal, or how you can win the game. Now think of the components of the game. Components are different pieces of the game (Monsters, Characters, Stats, Others). If you found the components of the game, now think of mechanics. It’s the thing you can do in the game such as interacting, walk, run, swim, jump, fly, sit, ragdoll, etc. Now the rules of the game, it is the game to what you can do and what you can’t do. Now the rest leads up to you.
You can also think of what you like, and how to make it into a game, and do research. You can also do other things you possibility you can do because you won’t be running out of game ideas. This is all I can possibly help.