Sometimes I forget to connect the charger to the laptop, and it discharges without realizing it. When I used xfce power manager, it warned me when the charger was disconnected, can tlp or acpitool send those types of notifications?

What are the differences between tlp and acpitool?

Also adding auto-cpufreq, ryzenadj, tuned.

But this depends on your CPU used.

TLP is good, tuned may be better?

TLP has a common USB lost issue, that is mitigated by disabling USB-autosuspend in the config. TLP config is found here

And if you need a tool for warning about AC disconnect, you can use a systemd service.

cat > /usr/local/bin/check_ac.sh <<EOF
#!/bin/bash

while true; do
    if [[ "$(cat /sys/class/power_supply/AC/online)" -eq 0 ]]; then
        notify-send -t 20 -a "Power" "AC Disconnected"
    fi
		sleep 20
done
EOF

chmod +x /usr/local/bin/check_ac.sh

cat > /etc/systemd/user/ac-warning.service <<EOF
[Unit]
Description=Monitor AC State and Notify

[Service]
ExecStart=/usr/local/bin/check_ac.sh
Restart=always

[Install]
WantedBy=graphical.target
EOF

systemctl --user daemon-reload
systemctl --user enable --now ac-warning.service