What Road Wheels to Upgrade to from Giant PR-2?

Hi All

I have a 2019 Giant TCR Advanced 1 road bike which came specced with a Giant PR-2 wheelset (rim brakes).

I'm looking to upgrade the wheels but really have no idea what would be a logical next step up from the PR-2's?

Wondering if anybody has any suggestions? Like I say, they need to be rim-braked but other than that I don't think I have any special requirements- I don't race so the bike is used for standard road riding and occasionally interval training, that type of stuff. I can't imagine spending more than £400 and ideally would like to spend less than that.

I guess I also might need to factor in availability if components are all currently stuck due to Covid and Brexit etc?

Cheers for any help, any pointers would be great!