optimization

I'm looking for a gaming PC with no set budget but around the $1500 AUD (Australia) mark preferably under it. I'm going to be using the build for moderate - high gaming. Currently playing fortnite but will be looking to play more demanding games in the future. I plan on having 1 monitor, and i also need windows operating system. I'm upgrading because currently i'm using a notebook laptop and cant run that many games and only get 20-30 fps in the ones i can. Thank you for your assistance.