Need some help setting up a proper Linux Server

Sorry if this is the wrong place to post this. Let me explain my situation;
I am trying to set up a VPS to handle some software through a browser. I decided to go with a Linux server as Windows Remote Servers have been so so in my experience.
After busting my head for a few days and knowing absolutely nothing about Linux, I got a GUI interface working, I made different users and got it all set up like I need it to.
But now that I am doing some final testing I stumbled upon a huge problem. Whenever I log into a browser and leave the windows open, if someone tries to log in, its like they're on a completely different machine and if they try to open the browser they will get an error that won't go away even if I log off, so I need to restart the vps everytime someone news logs into it.
I need a script so that it stays with just 1 user at a time and if someone tries to log in, it will disconnect the previous user but all information will stay the same for the new user and they can see everything as it is.

If someone can help me with this I will be extremely grateful, I know very few people that deal with Linux, even less Linux servers.
If its a lot of time and effort we can see about some sort of compensation. I am mostly looking for someone to take pity on my soul haha.

Hi there,
i am not sure if your setup is quite right for your usecase. But if you stick on one unix with multiple Users the easiest way would be to add the relevant Programms etc. to the autostart. So if a user logs into the vps e.g. the browser opens automatically with a specific page in kiosk mode or anything else.
Otherwise you should think about using instances of docker-container with a specific idle stance or a single guest-user account.

Best luck
Mf

While the picture of what you're exactly trying to do isn't clear to me.. why not use Teamviewer?

Did you use VNC?

I'm going to suggest you move to a managed VPS/host. Any fix for your current problem are merely temporary. Pay a little more get a managed VPS/host. Let them configure what you need while you focus on what you do know. Ijs if time is money you are going to waste a lot of it on this and hundreds of other learning curves to come.