Go to your favorite YT creator's channels and download important content! Educational content, lectures, nostalgic content. Anything and everything you have the storage for.
One day, it will be locked away behind paywalls, poisoned with ads, or just deleted entirely.
Part of preparing for war is stockpiling supplies. Buy bulk storage. An extra 2-4 TB hard drive can be bought for 100-200 dollars. It doesn't have to be fancy, get a friend or two to go in with you on it.
Download and save everything you value. Rip your physical media and save it, pirate the shows and movies you love. One day it will be locked away or stolen from you because the terms of service changed.
Please don't delay, I wish I had started years ago myself.