How to change user home directory when in use by /usr/lib/systemd/systemd --user

After copying all contents of a user home directory I'm trying to change the home directory to the new location. But systemd prevents me from doing this.

# sudo usermod -d /data/home/user/ user
usermod: user user is currently used by process 10050
# sudo ps -fp  10050
UID          PID    PPID  C STIME TTY          TIME CMD
user       10050       1  0 Nov23 ?        00:00:03 /usr/lib/systemd/systemd --user

How can I achieve this ? I'd like to avoid stopping services or rebooting the server just to move a home directory The user is not logged on, I checked using sudo who

cat /etc/redhat-release 
Red Hat Enterprise Linux release 8.5 (Ootpa)