Recurring revenue 

It's the gift that keeps on giving

Invest accordingly

Ex:

X-as-a-Service (SaaS, PaaS, IaaS) $TWLO, $NOW, $FSLY
Platform $ETSY
Tollbooth $V
Razor/blade $ILMN
Subscription $NFLX
Consumables $BYND
Business services $MCO
Real Estate $STOR
Membership $LVGO