Joomla Upgrade 3 to 4 Manually

Joomla 3.10 has entered the security-only mode. Support ends on 17 August 2023. Start planning to migrate to Joomla 4 today.

Before Update to Joomla 4

You need to sure that all your extensions (Components, Module, and Plugins ) are compatible with the latest Joomla 4 and PHP 7.4
Your theme is compatible with the latest Joomla 4 and PHP 7.4
if these are not compatible you will need to update these first. and Yes I will provide all Services I will check your site for compatibility with Joomla
if you have a Joomla 3.x then here are more possibilities to Update to Joomla 4
if you have Joomla 2.5 and 1.5 then update is not possible but migration of content, articles, images, and users is possible but it includes new website designing work of your choice CMS (Joomla/WordPress)