Meteor requires Node v14.0.0 or later.

[matttttttty]

Jul 08 08:27:47 localhost.localdomain systemd[1]: Started The Rocket.Chat server.
Jul 08 08:27:47 localhost.localdomain rocketchat[8986]: Meteor requires Node v14.0.0 or later.
Jul 08 08:27:47 localhost.localdomain systemd[1]: rocketchat.service: main process exited, code=exited, status=1/FAILURE
Jul 08 08:27:47 localhost.localdomain systemd[1]: Unit rocketchat.service entered failed state.
Jul 08 08:27:47 localhost.localdomain systemd[1]: rocketchat.service failed.

no sure why can't start the service

[ricardobad]

I had the same issue. You need to install NODEJS v 14 after all the script process. I tried this command
n 14.15.0

then
systemctl start rocketchat
Reboot the server

I hope this works for you