At 540 grams they are quite heavy and a bit Enduro / free ridey. It largely depends what riding you do.
Changing rims is expensive.
Many on here will tell you to get Stans Arch or Crest at £70 each, you will then need spokes and a build. So not any change out of £200 / £250.
If you want lighter sell your current wheels and buy some new ones maybe a Hope hoops creation for about £300 the pair if you shop around. Going to Stans rims will allow you to save weight by going tubeless.
But it all depends how much spare cash you have and what riding you do and how bothered you are about current wheel weight, and what bike you have.