When you pass your Part 107, small UAS (Drone) , test you are certified for 24 months. Within the next 24 months you can take an on-line test to renew. It is the Part 107 Small UAS Recurrent, ALC-677.

Part 107 sUAS Recurrent – Non-Part 61 Pilots Introduction
The FAA has developed regulations to allow the operation of small unmanned aircraft systems (sUAS) in the National Airspace System (NAS) for purposes other than limited recreational use. The rules are specified in 14 CFR part 107 and address UAS classification, certification, and operating rules.

This training is designed for non-part 61 pilot certificate holders (or those without a current flight review in accordance with 14 CFR § 61.56) who wish to remain current as a part 107 remote pilot with an sUAS rating.

Others may take this training as a self-study resource, including:

Aviation Safety Inspectors (ASIs)
Anyone interested in learning more about 14 CFR part 107

00:00 Intro
05:15 Part 107 Recurrent Test
10:00 Recurrent Exam Completion Certificate
12:04 FAA Safety WINGS program