Custom Joomla Component plugin upgrade to work with Joomla 4

I am looking for a Joomla expert to upgrade the code of two custom plugins of RSForm component (also a part of PHP into the component PHP textbox, if there is need), to work with Joomla 4. The plugins I'm currently using were created for Joomla 3.x and I need someone to fix the code to make the plugins work also in Joomla 4. The one makes a deletion at the database and the other calculates and compares, in order to disable the calendar under limitations.