Greetings and salutations,
I have reviewed your offer and I would like to propose a solution.
Since OSTicket is just a PHP program, migrating it to a new host is no problem at all. What I would like to do is to, first, set up the Ubuntu server with all of the necessities. Second, I would install Apache and PHP 7 (since the latest version of OSTicket supports it, and it is 3x faster than PHP 5). Third, I would download and set up OSTicket itself. Lastly, I would migrate all of the files to their respective places.
That should cover everything. If you wish, I could also harden your server for free and set up any other programs that you may wish to have on there.
If you are interested, please do not hesitate to send me a message.
Until then,
Best regards.