WP php update from 8.0.30 to new + staging

Looking for an experienced dev to update our outdated version of PHP 8.0.30 to the latest version update WP and make sure the site doesn't break. A staging site to make sure it's fine. We have been having occasional server not reposinsive errors in the past. Looking additionaly to solve that. Possible engagements on imporving site speed if successful and possible long term cooperation on other sites if successful. Any attempts to manipulate site speed scores will be reported and banned from upwork.