Problem after install 12.4

Hi Guys
Not been on for some time as my Zorin 9 had done me proud.
Nonetheless, i am trying to move on. so preparing my system to install 12.4.core
All seem to go fine install no issues.

However i have now tried to use the system but it is very sluggish, none responsive and most of the time hell bent on doing its own thing when it wants to.
Tried to install additional programs no joy
Looked at the following and not sure but it seem that the HDD is Full from the feed back, pls, see below:-
Well it now sees that i can not add a file either.

1.system full formated prior to install by Zorin
2.Memory 2MB Ram
3. Intel Celeron cpu 3400 @ 2.6GHz
4. Graph 341x86 mmx
5.OS Zorin 12.4 32bit
6.HDD 986.3

However the feed back i have is as follows viewing the system monitor shows;-

Device Dir type total Available Used
/dev/mapper / ext4 982.6GB 925.8 GB 6.8 0%
/dev/sda1 /boot ext2 754.4MB 5721.1MB 144.0MB 20%
/dev/loop0 /snap/core/51 squasl 86.0MB 0bytes 86.0MB 100%
/dev/loop1 /snap/ufw/96 squasl 786.4kb 0bytes 786.4kb 100%

Can you help?
cannot send images for some reason.

Before we go any further, is the Hard drive an SSD? or traditional Hard Drive? The partitioning is totally inappropriate for your Zorin install. Before I advise further I need you to answer the question on the type of Hard Drive you have installed. If 'normal' HDD then Ext2 is the wrong file system type for '/' and it is way too small.