Even due someone is investing in Bitcoin for the short term or the long term, it is advisable the person should have a source of income so that he/she will not rely on selling his Bitcoin holding to solve his life challenges. Fomo can also make someone to sell his Bitcoin holdings because he/she invested in Bitcoin to get some profit in an estimated time but when the profit doesn't come and the price of Bitcoin dips, that person might be forced to sell off his Bitcoin even at a loss.
If a person invests in BTC while they themselves do not have a source of income, their investment path will not reach their destination or be long term.
Life is full of challenges so a source of income is important if you only rely on investment alone then it will not be profitable while we know the price of bitcoin will not directly increase in a short time of course this requires a long time process so in addition you invest then on the one hand a source of income must exist to fulfill your life.
People who have invested while there is no source of income then undoubtedly the ownership will not be long will definitely sell in the middle of the road whether it is because of the needs of life, or fomo, it could be because the price dropped and sold it for fear of loss.
But with you there is already a source of income at least there is no pressure on your bitcoin ownership, so this can still survive to hold BTC.
That source of income is an interesting question.. because it is not an absolute to have a source of income, but if the person does not, then living off of their investments would be the source of income.. so it may or may not be healthy to start drawing upon your investment right away, but then the healthiness and/or the sustainability of drawing from one's investment has to do with the amount invested, how it is valued and then the withdrawal rate which would hopefully be enough to cover how much the person needs to live on a monthly and/or annual basis...
Usually, it is considered that a person can perpetually withdraw at 4% per year as long as the investment is growing at least at that rate... so if a person had a $1million bitcoin investment, then s/he should be able to withdraw $3,333 per month, but then the question would be how to value the investment, and I personally like to use the 200-week moving average for that, so the 200-week moving average is almost $29k, so $1 million would be 34.4827586 BTC, and so then there might be questions about whether to make withdrawals monthly, quarterly, annually or some other period of time, and so there could be strategies about withdrawals in such a way that is able to pretty much maintain the value of the BTC.. but maybe even for the BTC to continue to grow beyond the 4% withdrawal rate that also might get adjusted up with inflation, but also the person needs to develop some strategies around preserving the principle and not spending above a sustainable withdrawal rate.
A mistake that many people make is to prematurely withdraw the principle... but with bitcoin the errors still might be able to work themselves out as long as you still are careful not to overly withdraw too early.... and if you ONLY have 10 BTC, but you really should have 34.5 BTC, then you might not really be ready to live off of the 10 BTC, and so then a cashflow might be helpful until the 200 week moving average might reach $100k that will cause the 10 BTC to be worth $1million or maybe you might need them to reach $2million in value before you are able to feel comfortable to start to withdraw from them, so if you ONLY have 10 BTC then you would need the 200-week moving average to go up to $200k.. which may well be reason to preserve some other cashflow while the 200-week moving average is catching up to your desired area... which well could take 10 years for the 200-week moving average to move up from $29k to $200k and also it is not guaranteed, but a person with 10 BTC right now and a cashflow that is able to sustain themselves for another 10 years, may well be sitting pretty right now with such potentially good prospects... that are not guaranteed, even though they seem pretty good...