added .service's missing after the restart

[austrisv]

added a juice4halt service from ssh terminal
ln -sf /home/umbrel/juice4halt/conf/juice4halt.service /etc/systemd/system/
systemctl daemon-reload
systemctl enable juice4halt.service --now

checked status and all is good good
systemctl status juice4halt

after reboot I get "Unit juice4halt.service could not be found"

Shall I do anything special to persist the change or add the service from a different place? Apologies upfront for a newbie question. Did try a little bit of google search before posting, but apparently not successful with my keywords selection. Thank You!