How do I write the link from front-page.php to home.php?

There really should be a simpler way to do it but you kind of need to know that WordPress stores both the Front Page ID and Blog Page ID in the options table. So, to get the URL of the blog you need to use both get_permalink() and get_option() in conjunction.

<a href="https://wordpress.stackexchange.com/questions/270158/<?php echo esc_url( get_permalink( get_option("page_for_posts' ) ) ); ?>' title="<?php echo esc_attr( get_bloginfo( "title' ) ); ?>' rel="home">Blog Page</a>

The above will grab page_for_posts value from the options table which holds the Page ID of the blog which needs to be set in Settings -> Readings. By passing an ID to get_permalink() it will return the string URL that we need for the page.