assuming the observations aren’t all obscured…
maybe something like this: Map showing spread of spotted lanternfly since 2016 - Nature Talk - iNaturalist Community Forum, which is one application of the “experimental compare tool” (see Easy way to compare lists - Feature Requests - iNaturalist Community Forum).
or more of a timeseries animation: Map animation of observations over time - Feature Requests - iNaturalist Community Forum
there are other ways to achieve similar results, but those would require some other coding or manipulation of data on your own probably. if you want more details, just provide more information about exactly what you’re trying to achieve.