All posts in the single.php, possible?

Hello. I’m remaking my theme and i was wondering if its possible to show the last 10-15 post (or as many as I have on my first page) under the comments/single-post in the single.php

I was thinking not just the “title” but everything, images in that post, comment link, permalink, read more and so on, just like if the single.php was the first page.

I tried to copy that php-code fr?n the index-file to the single.php but i just get errors (no wonder). Could anyone tip me off what code i should use to make it work?

Here is my single.php and index.php as a txt-file if thats any help.
https://testblogg.barczyk.se/single-php.txt
https://testblogg.barczyk.se/index-php.txt