Usd 4k speaker recommendation pls

Thanks for the suggestion, anymore suggestion?

my old speaker is spendor s3/5. 150wpc mosfet amp (diy). room L4m x W5m x H3m. mostly listen to vocal.

spendor s3/5 is nice but i want more and feels that the spendor becoming the limitation in my system

thanks again for the help

did i mention i prefer bookshelf? i would love the vocal that could beat the spendor s3/5. thx