There are a lot of existing threads on the forum about IDing Unknowns that would be good to check out, including:
https://forum.inaturalist.org/t/good-global-criteria-when-identifying-unknowns/47167
https://forum.inaturalist.org/t/whats-the-fastest-way-to-identify-unknown-obs/52513
https://forum.inaturalist.org/t/identifying-taxa-just-to-remove-them-from-unknown/33749
https://forum.inaturalist.org/t/useful-inaturalist-tasks-for-non-experts-wiki/35034 (more broad, but includes IDing Unknowns)
and many more too
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