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.
As for me I think the waiting strategy is very wrong especially if the plan is to buy and hold for a long time, irrespective of the price points one can still buy Bitcoin at a fraction within the available discretional income, for a newbie I will advise him not to make an investment decisions under pressure or fomo, Bitcoin has a very long way to go such that the price we are seeing today might not be seen again or will be seen as a dip tomorrow, it is best he get the fucking started with the basic knowledge and invest with an amount he can be comfortable with either weekly or monthly after ensuring his other living expenses are taken care with a provisional emergency funds.