Invest as much as you can in Bitcoin, you will earn income even when you sleep. You can sleep soundly without having to think about negative things such as losses or so on, as long as you are able to maintain the security of your private key well, nothing can make you anxious about the assets you store.
I chose one of the three ways you mentioned, namely Bitcoin. DCA is a strategy used when investing, you can buy Bitcoin consistently with the same amount at regular intervals. When you already have Bitcoin, believe me, you will sleep soundly and Bitcoin can also increase your wealth.
Not saying Bitcoin is a bad investment, but it's incorrect if you say you will earn even when you sleep. If you didn't sell your coins, it's just an unrealized profit and if you're keep DCA-ing Bitcoin, this mean you still have a job to fulfill your monthly needs, not living by only with Bitcoin investment..
You can't invest in cryptocurrency and be sleeping in that your money is making profits for you, it might be partially correct with bitcoin investment but adding altcoins to the equation makes this sound odd especially with how sharp the volatility of all of these altcoins are, sleeping on them can put you to a loss if you ain't keeping steady track of them. We all know cryptocurrency investment is one mainstream investment right now that has changed the financial system from what it used to be but for me in my view it's not something you invest in and sleep on it withoit expecting anything of the negative to possibly occur. It's not that perfect.