One thing about long term Bitcoin investment is that one should not see it as source of income, when you remove your mind from seeing it as a source of income then you can grow more bigger.
If you are into Long term Bitcoin investment you can do other business if you wish one must not wait to accumulate enough Bitcoin before going into a business or investment that will give you income.
Bitcoin is very volatile and one can't predict what will happen in the future and that is why I'm saying one should not look at Bitcoin as a source of income because you may plan to sell of your Bitcoin in the next 3 to 4 years and that time a dip happens it will live you frustrated so since the income you are using to invest into Bitcoin is your Discretionary Income one can still invest in a business that will be giving him or her income weekly or monthly that way it will even help your Bitcoin investment to grow since income is now coming from different angles.
To succeed with long term Bitcoin investing think carefully. We Do not rely on Bitcoin for regular income. Its value goes up and down too much. Invest in other things that bring in money weekly or monthly. This will reduce money worries and help your Bitcoin investment grow. Separating your money goals will save you from stress when Bitcoin value changes. And if we will think that we can get regular income from Bitcoin so keep in mind we can lose our money too. So the best option for Bitcoin is to think only long term. Otherwise it can give us losses.