Joomla Professional here. Kindly share the link of your current website so that I will review it and also share admin panel access for the review of components, module and plugin which is used at the website.
I can surely upgrade to latest version of Joomla and Php version too.
I am ready to start the work right now. I am looking forward to work with you and awaiting for your positive response.
Have a great day!
Kind Regards,
Murtaza