Anyone?

You could serve your websites with Lumen and put AWS Cloudfront between your hosting and the domain endpoints to cache all websites. But if all your websites are low traffic, you could just host them directly from Lumen anyway, because you won't get any performance advantage. (Every time a user visits a website, the cache is probably expired and clouldfront has to hit the source anyway).

Thanks for the @thiver, is there any issue with Laravel and Lumen drawing from the same database?

Anyone else have suggestions?

you can cache the static sites. use varnish for http caching. sharing the database with multiple apps should not be a problem at all. If it is you can write an api.