Through the CSS you can just hide the posts. That means if you hide the first 5 posts then for the first page (Page 1) you will only get to see the remaining 5 posts out of 10 posts ( 10 posts is a default value, you can change it from “Settings > Reading”) but for the other pages you will get the 10 posts as it should be.
If its ok for you then please go to “Appearance > Customize > Additional CSS” and paste the below Custom CSS code.
body:not(.paged) .site-main .post-wrap .post-col:nth-child(1),
body:not(.paged) .site-main .post-wrap .post-col:nth-child(2),
body:not(.paged) .site-main .post-wrap .post-col:nth-child(3),
body:not(.paged) .site-main .post-wrap .post-col:nth-child(4),
body:not(.paged) .site-main .post-wrap .post-col:nth-child(5) {
display: none;
}
Thanks