If you want to upgrade, the first thing is to weigh the wheels you have. That will let you know what you have.
I know wheel weight can make a difference to some people. My wife rode a steel Univega for years. I had installed a set of Fulcrum R7 (eBay) lower level trainers when I converted it to a cassette. She got a newer aluminum frame road bike with Alex wheels and complained the bike felt slow. The wheels (no tires, no cassette, no skewers) weighed 2600 grams. Found a set of Fulcrum T’s (eBay) and all is well.
You don’t need $1000 wheels if you have wheels that weigh 5-6 lbs, you just need ones that are much lighter. But if your wheels are already sub-2000 grams, it won’t be worth the money to make a difference.
John