Cannot connect to home assistant - 0.91.x

Hi everyone,
since two days I cannot connect to my home Assistant frontend anymore, it says: “Error: Something went wrong” (FF) or “ERR_CONNECTION_REFUSED” (Chrome). I tried with both duckdns url and ip, no luck. I’m under SSL with updated certificate.
Let me copy paste some information I retrieved by logs:

Home Assistant service:

pi@zPI:/home/homeassistant/.homeassistant $ sudo systemctl status [email protected][email protected] - Home Assistant
   Loaded: loaded (/etc/systemd/system/[email protected]; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2019-05-02 12:12:02 UTC; 14min ago
 Main PID: 3331 (hass)
   CGroup: /system.slice/system-home\x2dassistant.slice/[email protected]
           └─3331 /srv/homeassistant/bin/python3 /srv/homeassistant/bin/hass -c /home/homeassistant/.homeassistant

mag 02 12:12:02 zPI systemd[1]: Started Home Assistant.
mag 02 12:12:08 zPI hass[3331]: Config directory: /home/homeassistant/.homeassistant

Mosquitto service:

pi@zPI:/home/homeassistant/.homeassistant $ sudo systemctl status mosquitto.service
● mosquitto.service - Mosquitto MQTT Broker daemon
   Loaded: loaded (/etc/systemd/system/mosquitto.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2019-05-02 10:28:53 UTC; 1h 58min ago
 Main PID: 962 (mosquitto)
   CGroup: /system.slice/mosquitto.service
           └─962 /usr/sbin/mosquitto -c /etc/mosquitto/mosquitto.conf -d

mag 02 10:28:53 zPI systemd[1]: Started Mosquitto MQTT Broker daemon.
mag 02 10:28:54 zPI mosquitto[953]: 1556792934: Loading config file /etc/mosquitto/conf.d/users.conf

Home Assistant log (this should be a previous error not related with current issue, but maybe I’m wrong):

2019-04-30 10:46:21 ERROR (Thread-2) [homeassistant.config] Migrating to google_translate tts failed
Traceback (most recent call last):
  File "/srv/homeassistant/lib/python3.5/site-packages/homeassistant/config.py", line 402, in process_ha_config_upgr$
    with open(config_path, 'wt', encoding='utf-8') as config_file:
PermissionError: [Errno 13] Permission denied: '/home/homeassistant/.homeassistant/configuration.yaml'

I already performed ‘sudo apt-get update’ and ‘sudo apt-get dist-upgrade’,
checked port 8123(correctly forwarded to my pi),
‘sudo chown homeassistant:homeassistant *’ in my .homeassistant config folder,
disabled tts in configuration.yaml,
deleted .storage/core.config_entries,
downgraded to 0.91.x,
updated to 0.92.2,
updated cerbot,
restarted tons of times…
still no luck.

I have about 50 devices in my home automations, any help would be very appreciated.
If you need more information let me know (I’m not that confident with linux, be patient).

Thanks
SoL