Place advertisement between 2 full posts on home page

Fatal error: Uncaught RedisException: OOM command not allowed when used memory > 'maxmemory'. in /var/html/www/wp/wp-content/plugins/wp-redis/object-cache.php:1362 Stack trace: #0 /var/html/www/wp/wp-content/plugins/wp-redis/object-cache.php(1362): Redis->set('posts:wp_query:...', 'a:3:{s:5:"posts...') #1 /var/html/www/wp/wp-content/plugins/wp-redis/object-cache.php(956): WP_Object_Cache->_call_redis('set', 'posts:wp_query:...', 'a:3:{s:5:"posts...') #2 /var/html/www/wp/wp-content/plugins/wp-redis/object-cache.php(254): WP_Object_Cache->set('wp_query:29abdf...', 'a:3:{s:5:"posts...', 'posts', 0) #3 /var/html/www/wp/wp-includes/class-wp-query.php(3331): wp_cache_set('wp_query:29abdf...', Array, 'posts') #4 /var/html/www/wp/wp-includes/class-wp-query.php(3787): WP_Query->get_posts() #5 /var/html/www/wp/wp-includes/class-wp-query.php(3919): WP_Query->query(Array) #6 /var/html/www/wp/wp-content/plugins/bbpress/includes/replies/template.php(193): WP_Query->__construct(Array) #7 /var/html/www/wp/wp-content/themes/onetest1/bbpre in /var/html/www/wp/wp-content/plugins/wp-redis/object-cache.php on line 1362