Once you get this issue corrected then we can check the next issue you may be having but right now it seems that your Mautic Site URL isn’t set up correctly or you have taken Mautic down.
I can help you with setting up Mautic on cPanel however we need to restore it before I can help you with this.
It may be challenging for me to help you because I am in USA and at work right now. Your Mautic took about 3-4 minutes to load for me so internet may not be so great between us.
You Mautic did load and what issue are you having with it? Team viewer probably will be a pain to connect with a big delay between our countries internet.
Maybe create a temporary user account for me in cPanel and send me a DM with the info then we can look into it but I need to know what is the issue are you having? I am not clear what your issue is in this thread yet.