Job security is important to consider before starting your bitcoin investment because it will help you take care of your personal needs. If you think someone will be laid off from his job for no reason before that person starts his bitcoin accumulation journey, he or she should save a reserve fund that he or she will use in the future in case he or she loses his job that will help to settle his financial needs until he or she gets another job so that he or she will not depend on his bitcoin investment to settle his financial needs.
Main job and part time job is very important thing to be long term investment in bitcoin, not get stable financial will difficult how to manage our salary for daily needed and investing in bitcoin. Personally had an exceptional for some one not marriage yet because their daily needed not spend large amount every day and can spent more than 60% of their salary for investing in bitcoin.
Have well main and part time job will be easy for accumulating bitcoin in daily or monthly but not support with good payment salary in offline work will face difficult how much have to spent for accumulation bitcoin and another side we need spent money every day for daily needed.
Work hard right now and invest as much possible in bitcoin before getting disappointed in one day later when bitcoin have raised more higher price.
I don't know how you guys comes up with some conclusions. What brought main job and part-time job into this discussion? Why not simply put it that one need a good cashflow to be able to invest in Bitcoin? Many people in this forum have their source of funds in diverse ways like inheritance, business and so on. Your assertion of making main job and part-time job a prerequisite for bitcoin investment might be misleading. Anyone with a source of income can invest in bitcoin, he must not do two types of jobs to do that because investment is made with money and not job. I understand that you are suggesting a secured source of cashflow but your choice of words seem to be the problem.