It is reasonable advice for me, but I still invest in trading all of my money.
You know, sometimes I restrict myself in something in real life and instead of this I keep buying new crypto or deposit funds on margin account
You may invest on trading all of your money no one can keep you away from doing that but think twice if you loss 80% or more from your investment. Then you will have nothing to do. It is your money so, decision is yours too.