You don't need to wait to be able to afford half of a Bitcoin, buy as much sats as you can afford now based on your income and repeat that at regular intervals.
Rather than giving financial advice and making repeated threads, you should focus on improving your knowledge on how Bitcoin works, this would put you in a better financial position.
When one waits for a low in bitcoin price how can one be sure which price will be the lowest low price of bitcoin at that time. And how can a person decide which rate is the most dip? So following DCA I think is the best formula. And also one should invest as much as one can afford so that if its price goes down too much, then it will not suffer any big loss. Yes buying bitcoin at low price is always a good idea but predicting the lowest price accurately is not a very easy task. It requires a great skill of market analysis which not everyone has so I think only DCA is the best formula to invest in Bitcoin for everyone.