I have a Intel uhd graphics 630 card, what's the best card to upgrade to?

It depends. Which resolution do you want to play in, which details, what framerate are you targeting, do you want to play Squadrons in VR (and if so, which VR Headset/Resolution do you wish to use)? What is your budget (although it will be hard to go by that with the current crazy GPU prices)? What's your power supply rated for?