How do i fix my booting issues

[Windows Server]

I have 2 ssds, 1tb (my main) and a 500gb (my backup) yesterday I was able to boot up completely fine into my main ssd but today I cant. I dosent show up in bios as a boot device and when I try to boot up my pc it boots on my 500gb ssd. If I unplug my 500gb ssd tho I can boot into the 1tb fine but even then it still dosent show up as a boot device in bios. I can only boot up into it if I unplug my 500gb ssd otherwise it'll be overrided

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