You have some good points regarding diversification. Back in 2017, I tried day-trading for three weeks, in the crypto space. This was all-in, in chunks of 1/4 to 1/3 of my total crypto money, which wasn't more than just pocket money. Turned out, day trading is not something I liked, though I made good gains (not that difficult in a bull market :)).
Content diversification is key for me. I really can't write about the same topic all the time. My interests are so much wider than just a topic. Also, I get bored when I read the single topic content from other users. Seems many users at HIVE, think otherwise since many produce some topic content. I don't understand why though. Lack of creativity maybe?
Agree with you, a secondary income would be most beneficial. I would suggest, to create an income stream such that all your cryptos are more a bonus than an income stream. In such an approach, you'll be able to make the most out of crypto, in the long run.
