Reducing the disk space of a virtual Oracle machine [closed]

I have allocated too much memory on my virtual machine and there is not much left on my host one. I want to reduce my memory on my virtual machine and my host one to take it. My host machine is Windows and my virtual one is Ubuntu.

Here's what I have tried:

On my virtual machine I used gparted to make a new partition with the memory I want to free and allocate by my host one:

image that shows how I have seperated my partitions

I did this in order to zero out my new partition and use oracle's modifymedium --compact command to free this memory, but that didn't work among other things I have tried.

That's the specific command I have used to zero out the space:

sudo dd if=/dev/zero of="New Partition #1" bs=1M

somewhere I have read that I need a specific path of this partition in order to be sure that the command would work, but it seemed like something happened after that command and I didn't provide a path since it looks like it isn't assigned any. After lsblk I get:

NAME                      MAJ:MIN RM   SIZE RO TYPE MOUNTPOINTloop0                       7:0    0  55.4M  1 loop /snap/core18/2846loop1                       7:1    0  63.3M  1 loop /snap/core20/1828loop2                       7:2    0  91.9M  1 loop /snap/lxd/24061loop3                       7:3    0   132M  1 loop /snap/docker/2932loop4                       7:4    0  63.7M  1 loop /snap/core20/2434loop5                       7:5    0  73.9M  1 loop /snap/core22/1663loop6                       7:6    0 139.6M  1 loop /snap/docker/2963loop7                       7:7    0  73.9M  1 loop /snap/core22/1722loop8                       7:8    0  91.9M  1 loop /snap/lxd/29619loop9                       7:9    0   1.1M  1 loop /snap/mosquitto/904loop10                      7:10   0  44.3M  1 loop /snap/snapd/23258loop11                      7:11   0  38.8M  1 loop /snap/snapd/21759loop12                      7:12   0  11.1M  1 loop /snap/ngrok/226sda                         8:0    0 976.6G  0 disk ├─sda1                      8:1    0   1.1G  0 part /boot/efi├─sda2                      8:2    0     2G  0 part /boot└─sda3                      8:3    0 488.3G  0 part └─ubuntu--vg-ubuntu--lv 253:0    0   100G  0 lvm  /sr0                        11:0    1  1024M  0 rom  

and /dev/sda3 is my main partition that I do not want to modify and want to keep as it is in my virtual machine.

That's the output of my modifymedium --compact command:

./VBoxManage modifymedium --compact "..notImportantPathToShow\workspace1.vdi"0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%

However, after all this nothing changes in my virtual machine.

What can I try next?