If you want to get even more involved with research, here is a list of researchers/projects who are looking for specimens (probably a bit outdated): https://forum.inaturalist.org/t/opportunities-to-assist-researchers-wiki/16615
Other than that I tend to agree with @egordon88’s first suggestion - the observations that feel the most meaningful to me are the ones that were significant discoveries (e.g. first record of a taxon for your region or other significant range expansion, undescribed species).
Naturally there’s no reliable way to find those, other than post everything that’s possibly alive and focus on obscure taxa and discovery strategies. The rate of discovery for something significant is low though so I don’t think it’s a sustainable primary goal. For me it’s a been a fun side-effect of trying to see as many species personally as I can.