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Overall, I completely agree with your assumption, because having multiple sources of income will certainly ensure our Bitcoin investment remains untouched or unaffected. However, I believe that in addition to having multiple sources of income, we should also cut back on non-essential expenses. I believe this is also crucial. It's essentially the same if we have multiple sources of income but are wasteful with our lifestyle. Therefore, it's better to combine multiple sources of income with a simple lifestyle. And that way, I'm sure our Bitcoin investment will run more smoothly.
Having multiple sources of income is good to make available more discretionary income that we can use to invest into Bitcoin. However even the funds from the multiple sources aren't managed properly by being as aggressive as possible without overdoing it and building out our emergency fund and other variances of backup funds in the process of accumulating Bitcoin, our portfolio still has the rights of being tempered regardless of our multiple sources of income.
This is why good cashflow management practices are very vital in our investment journey as it ensures our expenses is well planned and catered for and discretionary income are well identified and utilized properly. Good cashflow management practices helps us remain consistent in buying Bitcoin since every fund that comes our way is well utilized for it's various purpose and constant repetition of those practices ensures consistent purchase of Bitcoin and building of backup funds which would in turn guard our investment from actually being tempered.