@housecrows I approved your post in the General category for now, since at this point it seemed to be more of a question than a specific feature request.
As documented here, there are a number of additional filtering capabilities in iNaturalist that are not available through the standard Filters interface, but instead require direct manipulation of the URL. The good news is that these URLs can be bookmarked in your browser (or saved in a text file outside your browser) and returned to repeatedly to view new observations.
The following URL should find all of the verifiable observations of birds, lepidoptera, and odonata in Japan:
https://www.inaturalist.org/observations?place_id=6737&subview=table&taxon_ids=3,47792,47157
To only see the ones that you have not already identified or marked as Reviewed, use
https://www.inaturalist.org/observations?place_id=6737&reviewed=false&subview=table&taxon_ids=3,47792,47157