It is better you invest low amount of money on bitcoin right now. If your salary is $400 monthly, you can be investing like $20 on bitcoin which is 5% of your monthly income . The price is high already but there is tendency that the price might go up. If you can be patient, wait until the next bull market begins after the coming bear market to invest more. I may not be absolutely right but that is my opinion.
To be sincere judging from bitcoin's current price mark along so the momentum it's been keeping up for a long time now, its quite too small to be investing $20. Yes we often use the statement Risk what you can afford to lose, however sometimes you just have to take a bold step and a smart one at that. Infact as a bitcoiner too you will agree with me that it's worth taking the step if you are ready of course.
Infact if you weigh the odds, let's see we are at a 100k now and assuming op buys a total of $60 worth of bitcoin and we experience a pull back in a couple of months then op will likely end up being short a couple of dollars in addition to the little amount he put into investing.