Login to the Kinetic Panel
Stop your server.
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Go to the settings page.
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In the settings menu, click "Reset/Reinstall server".
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You'll then be met with this menu. If you wish to wipe your server completely, you will need to check the box that states "Delete all files before reinstalling". However, if you only wish to switch your server back to its original settings and wish to keep your other files, you won't need to check this box. Once you've made your decision, click "Yes, reinstall server"
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After following all these steps, your server has now been reset/reinstalled.
notice
This will Not reinstall anything you have on your server. This will Only reset your server to when you first ever purchased it and install Vanilla Minecraft.
That is how you reinstall your server.