Improving site rank in UK


I have a website which i am working on currently, All my posts are ranking on top 10 which I have written in past few months (except recent ones.). Many of them are in top 5 as well as in snippets. Considering U.S traffic ranking
But at the same time my site doesn’t do that well in U.K. Actually this is the first site i have made in few years which has equal share of traffic expected from Us and UK while in past i had only targeted US.
So, can someone help suggest what can be the reason for falling back in UK serps. Most articles are not even in top 2 pages In UK serp. Can GDPR be the cause? If yes, how to fix that.
I already have a popup and cookie policy in place along with a good privacy policy and about us page!
Can grammer and UK and US english being different be the cause?
Thanks in advance!