I wan to report back to that point, I got a greater mSATA
with 256 GB space and were installing all partitions once more again, and now all is fine for me, with no hassle or
problems running out of space.
frank@lankeeper:~$ sudo lsblk -o NAME,FSTYPE,SIZE,MOUNTPOINT,LABEL
NAME    FSTYPE     SIZE MOUNTPOINT                    LABEL
loop0   squashfs  63.3M /snap/core20/1822
loop1   squashfs 111.9M /snap/lxd/24322
loop2   squashfs  49.8M /snap/snapd/18357
loop3   squashfs 116.8M /snap/core/14946
loop4   squashfs   9.6M /snap/canonical-livepatch/209
sda              238.5G
├─sda1               1M
├─sda2  btrfs        5G /boot
├─sda3  ext4        20G /
├─sda4  ext4        20G /home
├─sda5  ext4        20G /srv
├─sda6  ext4        20G /usr
├─sda7  ext4        20G /var
├─sda8  ext4        20G /var/lib
├─sda9  ext4        20G /usr/local
├─sda10 ext4        20G /srv/www
├─sda11 ext4        20G /srv/ftp
├─sda12 ext4        20G /srv/rsync
├─sda13 ext4        15G /tmp
├─sda14 swap         4G [SWAP]
└─sda15 ext4      14.5G /var/tmp