Don't worry.
If your last EAD has the expiration date mentioned below, it is automatically renewed.
Here are the dates: ( And don't forget to thank "Adhikaar" on facebook or twitter, they have been fighting for you and all 15000 Nepalis)

Table 1—Affected EADs

If an EAD has a category code of A-12 or C-19 and an expiration date of: Then the validity of the EAD is extended through:
07/22/2017 01/04/2021
11/02/2017 01/04/2021
01/05/2018 01/04/2021
01/22/2018 01/04/2021
03/09/2018 01/04/2021
06/24/2018 01/04/2021
07/05/2018 01/04/2021
11/02/2018 01/04/2021
01/05/2019 01/04/2021
04/02/2019 01/04/2021
06/24/2019 01/04/2021
07/22/2019 01/04/2021
09/09/2019 01/04/2021
01/02/2020 01/04/2021
01/05/2020 01/04/2021
03/24/2020 01/04/2021