Repair and improvement of php site

Hello everyone! I have a php site built 7 years ago, I am interested in making improvements and changes to suit our world today :) I made explanations using images divided into each category on the site (simple to understand). In addition I am available for any question. The improvements mainly include: - Upgrading the site to php7. - Improving site speed. - Security enhancements. - Bug fixes. - Add new options. - Changes in site visibility (no design knowledge required except CSS). - Visibility on Google. -Adapting the site to different screens. I have big ambitions for the site, I am looking for a professional job :)