But now it is working, I've already tried the dietpi-letsencrypt before without changing the settings.
Well, it is good now, thanks for the support

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root@DietPi3:~# systemctl status certbot.timer
● certbot.timer - Run certbot twice daily
Loaded: loaded (/lib/systemd/system/certbot.timer; enabled; vendor preset: enabled)
Active: active (waiting) since Sun 2020-04-19 23:58:21 CEST; 21min ago
Trigger: Mon 2020-04-20 15:24:44 CEST; 15h left
Apr 19 23:58:21 DietPi3 systemd[1]: Started Run certbot twice daily.
root@DietPi3:~#
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systemctl cat certbot.timer
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systemctl restart certbot.timer
systemctl status certbot.timer
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root@DietPi:~# systemctl cat certbot.timer
# /lib/systemd/system/certbot.timer
[Unit]
Description=Run certbot twice daily
[Timer]
OnCalendar=*-*-* 00,12:00:00
RandomizedDelaySec=3600
Persistent=true
[Install]
WantedBy=timers.target
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root@DietPi:~# systemctl restart certbot.timer
root@DietPi:~# systemctl status certbot.timer
● certbot.timer - Run certbot twice daily
Loaded: loaded (/lib/systemd/system/certbot.timer; enabled; vendor preset: enabled)
Active: active (waiting) since Tue 2020-04-21 11:17:00 BST; 6s ago
Apr 21 11:17:00 DietPi systemd[1]: Stopping Run certbot twice daily.
Apr 21 11:17:00 DietPi systemd[1]: certbot.timer: Adding 28min 1.794925s random time.
Apr 21 11:17:00 DietPi systemd[1]: Started Run certbot twice daily.
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certbot.timer: Adding 28min 1.794925s random time.
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systemctl list-timers --all
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root@DietPi:~# systemctl list-timers --all
NEXT LEFT LAST PASSED UNIT ACTIVATES
Wed 2020-04-22 11:09:00 BST 28min left Wed 2020-04-22 10:39:08 BST 1min 19s ago phpsessionclean.timer phpsessionclean.service
Wed 2020-04-22 12:34:27 BST 1h 54min left Wed 2020-04-22 00:28:07 BST 10h ago certbot.timer certbot.service
Wed 2020-04-22 21:17:43 BST 10h left Tue 2020-04-21 21:18:26 BST 13h ago systemd-tmpfiles-clean.timer systemd-tmpfiles-clean.service
n/a n/a n/a n/a apt-daily-upgrade.timer
n/a n/a n/a n/a apt-daily.timer
5 timers listed.
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NEXT LEFT LAST PASSED UNIT ACTIVATES
Wed 2020-04-22 12:34:27 BST 1h 54min left Wed 2020-04-22 00:28:07 BST 10h ago certbot.timer certbot.service