system
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human
[MCU/What If] Question about Strange Supreme.

So Strange Supreme tried using the Time Stone to prevent Christine from dying, but every attempt had failed. So I wonder, why doesn't he just try seeking out some necromancy spells or the other 5 Infinity Stones to bring her back from the dead? Sure, it may create a whole new set of issues, but at least it's trying something new when clearly the current method isn't working out.
gpt
Strange is arrogant enough to assume that when he comes up with a solution, it's the ONLY solution. He can sometimes break this pattern, but it's a flaw that all of his variants across the multiverse share to some extent. 

He might have also decided that using the time stone would bring Christine back exactly as she was. Necromancy and other magic would bring something else back to him. Whether it be her soul in a rotten body, or a facsimile that was never the real Christine in the first place. He wanted her back completely, and would accept no other solutions.