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Update 3/29/2023

Now I am getting message that it has only 841 MB disk remaining

But why?

>df -H
Filesystem      Size  Used Avail Use% Mounted on
dev              23G     0   23G   0% /dev
run              23G  1.1M   23G   1% /run
/dev/sda1        68G   37G   28G  58% /
tmpfs            23G   25k   23G   1% /dev/shm
tmpfs            23G  4.8G   18G  22% /tmp
tmpfs           4.5G  123k  4.5G   1% /run/user/1000
public_html     4.1T  1.1T  3.0T  26% /mnt/g/public_html

Update

Added info requested

>df -Thi
Filesystem     Type     Inodes IUsed IFree IUse% Mounted on
dev            devtmpfs   5.3M   451  5.3M    1% /dev
run            tmpfs      5.3M   638  5.3M    1% /run
/dev/sda1      ext4       4.0M  794K  3.3M   20% /
tmpfs          tmpfs      5.3M     7  5.3M    1% /dev/shm
tmpfs          tmpfs      1.0M  131K  894K   13% /tmp
tmpfs          tmpfs      1.1M   113  1.1M    1% /run/user/1000
public_html    vboxsf     1000 -976K  977K     - /mnt/g/public_html

And

sudo du -s -h -x /*
0   /bin
76M /boot
20K /desktopfs-pkgs.txt
0   /dev
14M /etc
11G /home
0   /lib
0   /lib64
16K /lost+found
8.0K    /mnt
793M    /opt
du: cannot read directory '/proc/520610/task/520610/net': Invalid argument
du: cannot read directory '/proc/520610/net': Invalid argument
du: cannot read directory '/proc/520665/task/520665/net': Invalid argument
du: cannot read directory '/proc/520665/net': Invalid argument
du: cannot access '/proc/520912/task/520912/fd/4': No such file or directory
du: cannot access '/proc/520912/task/520912/fdinfo/4': No such file or directory
du: cannot access '/proc/520912/fd/3': No such file or directory
du: cannot access '/proc/520912/fdinfo/3': No such file or directory
0   /proc
328K    /root
8.0K    /rootfs-pkgs.txt
1.1M    /run
0   /sbin
12K /srv
0   /sys
4.4G    /tmp
18G /usr
5.3G    /var
>