Strange URLs in sitemap

Hi, I have registered an expired domain and built a new site on it (exact same service business bit differrent company and the domain has 1 backlink) When I submitted the sitemap in GSC there are about 1,000 urls with the string: /?g= followed by words I have blocked this string in robots.txt and resubmitted the sitemaps 2 months ago but they are still there in GSC and the website is having trouble getting its inner pages indexed which are 5 services and 9 locations. The website has just had its first keyword appear for ranking on Semrush so it may be a good sign that a correction is starting but I was wondering if there was something else I should be doing to fix this? Thank you.