Do you happen to live in North America? If so I’d highly recommend checking out the Xerces society plant lists for recommended species that support local pollinators. The plant lists include timing info for suggestions on what would bloom the rest of the year, because as you mention lilacs are fairly short bloomers (might I recommend my namesake, the humble fireweed, which is a late summer bloomer?)

A reason that everyone should get behind:

AI = increased carbon emissions for a product that won’t even be useful because AI is really unreliable.