Can't re/set admin room

[RoiArthurB]

Issue

Pretty much as the title says.

I stupidly left my HS's admin room and I can't join it again. So I looked at the documentation and issues here and found a pretty similar issue: #579

So, as recommended by AndrewFerr in it, I removed the room, added back the bot in a new conversation, rebooted the server entirely; but it doesn't fix it and doesn't display any error in the logs anymore...

$ journalctl -fu matrix-hookshot
Sep 16 19:13:50 DietPi systemd[1]: Starting matrix-hookshot.service - A bridge between Matrix and multiple project management services, such as GitHub, GitLab and JIRA....
Sep 16 19:13:50 DietPi matrix-hookshot[66365]: Error response from daemon: No such container: matrix-hookshot
Sep 16 19:13:50 DietPi matrix-hookshot[66398]: Error response from daemon: No such container: matrix-hookshot
Sep 16 19:13:50 DietPi matrix-hookshot[66416]: 6513d71b9d74a04db855fedaed8649e26b997432698e01fde43ee53526b9d0ae
Sep 16 19:13:51 DietPi systemd[1]: Started matrix-hookshot.service - A bridge between Matrix and multiple project management services, such as GitHub, GitLab and JIRA..
Sep 16 19:13:56 DietPi matrix-hookshot[66469]: INFO 12:13:56:301 [ListenerService] Listening on http://0.0.0.0:9000 for webhooks
Sep 16 19:13:56 DietPi matrix-hookshot[66469]: INFO 12:13:56:308 [ListenerService] Listening on http://0.0.0.0:9003 for widgets

The only command working is the general !hookshot help but nothing else (see screenshot below).

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How can I fix this issue ? Namely, found a way to either fully reset the bot, or more simply set a new admin room address to be able to administrate it.