A few things you should keep in mind when modeling.
How can I improve my modeling skills?
You should look into memorizing more keybinds(if you’re using blender, etc.) to work more diligently and maybe find new tools to use (If you hadn’t already). Another thing is practicing with real life references, this can enhance your skills a lot, learning new techniques is always helpful.
Should I use plugins?
If you’re showing off models to look for work, I recommend using Model Scopes. It completely changes everything to white, so that the selected model can be professionally showcased in portfolios, etc.
If you’re building within studio, I recommend looking at some videos on YouTube explaining what each plugin does. (There’s a lot of helpful building plugins!)
Should I start making a game?
If you’re confident with your work, go for it! It’s always good practice to make concepts of games, even if they’re failures, it’s always good to ask for feedback. It’s good to make a portfolio, and then slowly add new and more impressive work to it as you delve deeper into modeling/building on ROBLOX.
Hope this helps!