Hello i am trying to make it so it is PVE during the day (Ingame time) and PVP during the night, but i am abit lost on how. if you someone could it would be appreciated

this is explained in the documentation, and the same answer is already pinned in 2 threads and answered in more. the only difference is how you input time. instead of 0. - 6. you would use *.HH:MM

I have a problem where like after 1 cycle it wont turn off/turn on again it like only does it 1 time

I believe you have to put the exact command as nivex showed - *.HH:MM
You have to do something like:

"*.08:00 PVE PVE ENABLED!",
"*.22:00 PVP CAREFULL, PVP IS NOW ON!"

You have to copy the code exactly like this. Only changes you can make are the time you want it to start and end (you have to set both otherwise it wont toggle). After the time those - PVE PVP - that you see are the names I gave to my settings. On the original file you only have "default". You can use this since its set to be pve. You just need to create an extra one and call it PVP or whatever. If you call it something else change the first PVP to that name. If you use the default name change the pve I showed to default.

Last, after - PVE PVP - you can write any message that you want that players will be able to see. That is it.