ubuntu disk space issue

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Hello,
I have an hp laptop running windows, and i installed Ubuntu on it (dual boot).
My problem is, back then i was not really aware of what im doing, so i gave 'root' 30gb of space, and 200gb for '/home' ... now im enjoying my experience more on ubuntu, and i would like to adjust this diskspace issue and give my root directory more space so i can install additional stuff.
option 1: transfer some of the 200gb from '/home' to '/' ...
option 2: transfer some of the available space on windows to '/', (this option would be the ideal one i guess since im not using windows that much).

Is there any help you could provide on how to proceed with any of both options? which is easier ? Im afraid of damaging anything that's why i thought it would be best to ask first

N.B: I checked online and many are recommending to boot from live CD/USB, which i do not have anymore.
I don't possess the usb i used to install ubuntu few months ago.

Your help would be highly apprecaited.
Thank you

There are a handful of other options you could consider. 30GB is actually more than enough space for your root /, so personally I wouldn't worry about expanding it. You generally want your /home/ to have the most available space, which you do. On a server, you will find that /var/ and /srv/ are the two folders that fill up with the most data. In your case, you could shrink or delete your Windows partition, create a new partition with the free space, and then just mount that new partition to whatever folder it is that is consuming all of your space.