It is a good decision if you invest 60% of your savings in bitcoin, in other words you have 100% of your savings and of course you have managed your needs well so that you have savings and risk funds or emergency funds for your needs in the next few months. . 40% of savings if you feel enough with it to cover unexpected budgets beyond the budget needs that you have made before.
Maybe I'm trying to understand that 60% is from savings not from the income you have, so I totally agree about investing 60% of savings.
I don't agree with your question, maybe 40% for investment is realistic for long term investment and 60% for allocation for priority needs and some for unexpected urgent needs, if you increase more funds for investment then something you have to cut crypto investment costs for priority needs because you do not have other funds if there is an urgent need for medical expenses. So a wise investor will never allocate investment higher than priority needs, moreover crypto investment is also a high risk unless you are willing to hold it for the next few years.