Check configuration file
hass --script check_config
Restart Service and check logs
killall hass ; hass --daemon ; tail -f home-assistant.log
Update home assistant version
pip3 install --upgrade homeassistant
Afterwards, restart homeassistant like the command above. Be patient, the first run after update can take more than 5 minutes to boot, it will try to update all the components. Check the logs for errors (for example, different configuration syntax on some update).