I know some people say they find growth and meaning through the storylines in video games and I'm not trying to invalidate that, but I find I personally get way more rewards from reading a challenging book or learning an instrument or developing a hobby or something.
In the Dark Souls community there are many challenge runs, for example finishing the game without leveling up your character, or by using only unupgraded starting weapons. When you play the games for the first time, you struggle even with a fully upgraded character and weapon, but after a while you don't need them. This gives a great sense of accomplishment.
Another need, related to mastery, is competition and overcoming opponents. When you start out playing Rocket League or Fortnite, you usually don't do very well. But as you play more, you become better and can do more things in game. Each new personal level of skill has its own challenges. Some people actively use the practice mode in the games to improve certain mechanics, others just play a lot of matches and improve that way. I would view a (to you, not compared to the pros) perfect Rocket League goal as something expressing both artistry, skill mastery, and an expression of your personal playing style. If you want to become good at either game, you also need intellectual growth, because you need to read guides online or watch YouTube videos to learn how to do new things, and then you try it in game until you learned them yourself.
Actually, even though they get critisised a lot because of loot boxes, skins in online multiplayer games also serve as personal artistic expressions. Designing an 80s-themed Rocket League car, or a car as disgusting-looking or silly-looking as possible, and showing it off to your teammates and opponents is definitely an expression of your person.
Also, to me, no one needs to see your creations for them to be artistic personal expressions. If your hobby is to draw or write short stories, that's a way for you to express yourself even if you never show them to anyone. It's the same with your house in Minecraft.