So I would advice that your cousin to first of all look for a job, then after that, depending on how much he is being paid, he would have to remove like 10% or 15 % from it as long as it's an amount he can do away without, with that, I believe that he can start his accumulating journey till he is quite ok with the stash of Bitcoin in his possession.
He can always buy with any amount that won't empty his pocket and salary if ever his cousin has already a good job. It's hard to rely on it if he doesn't have alternative source of income and it's a good suggestion to let him find first something stable for him to do whatever he can and won't be affected a lot by the market's volatility. Many quits because they didn't anticipated the high volatile of the market because they thought that it will be easy for them.