If your systemd service is failing with the following error message:
XXX.service: Start request repeated too quickly
The first thing to do is fix any underlying issues. Use ‘systemctl status <service>’, ‘journalctl -u <service>’, and search any log files produced by the service to understand why the service failed multiple times and exceeded its StartLimitBurst.
If you have fixed the underlying issue, then you can reset the start rate limit counter for the service.
sudo systemctl reset-failed <service>
REFERENCES
freedesktop.org, systemd StartLimitBurst
suse.com, exceeded StartLimitBurst
serverfault.com, service start request repeated too quickly
unix.stackexchange.com, how to fix service start requested repeated too quickly