Update your qBittorrent.conf trackers list automatically!

You must enable the Automatically add these trackers to new downloads config

or add manually, if not already specified

[Preferences]
...
Bittorrent\TrackersList=     <- this line under preferences section
...

tracker_updater -conf <qBittorent.conf path> -profile <tracker list type>

$ mv qb_tracker_updater-[arch] /usr/local/bin/qb-tracker-updater
$ qb-tracker-updater --help

1. best
2. best_ip [default]
3. all
4. all_http
5. all_https
6. all_ws
7. all_ip

This program can run seamlessly before qBittorrent stars, just add ExecStartPre options to your systemd service file

...
User= user
ExecStartPre=/usr/local/bin/qb-tracker-updater
# /usr/local/bin/qb-tracker-updater -conf [to manually specify] -profile [profile number]
ExecStart=/usr/bin/qbittorrent-nox
...