It might be very impossible to reach 1 bitcoin in 10 years with weekly buys of $250 worth of bitcoin which would amount to $130,000 in 10 years due to bitcoin progression. In ten years time, it is projected that bitcoin price should be near $500k at least which depending on the level of volatility could rise above $150k before the year runs out.
The most important thing should be maintaining your DCA allocation and keeping to it strictly except in the case of pay raise which you may consider to increase your DCA allocation which would also increase your chances of achieving the 1 bitcoin 10 years projection. Cooperate bodies have upper hands as they can easily acquire this in months. So to this end, it's more advisable to focus on the amount you intend to invest and the period of time you intend to invest such amount (probably 10 years or more) instead of focusing on the amount of bitcoin you wish to acquire which could expose you to investing beyond your capacity when the time frame seems too short to achieve same. What matters more is accumulating continuous and seeing bitcoin rise to where it belongs. Whichever way, you still stand a chance to make profits at them end.
We should never look at the price. As you said, after 10 years, the price of Bitcoin will reach 500k dollars. This is not impossible. But if we look at it from the above, a person who will invest and his goal is 1 BTC. If he starts investing now, he will continue to accumulate Bitcoin in his portfolio and if the price of Bitcoin increases, the value of his accumulated Bitcoin will increase. So we should never do this.
We should always continue to buy continuously. If we continue to buy continuously, then after a while we will be able to build a much larger portfolio. We have to maintain our holdings in the long term.
Yeah we should not look at the price but rather people should focus on their accumulation. If that price they projected to happen will come then its good that's why its better for us to accumulate according to what they can able to spend.
Checking price is not really helpful since they might get distracted by dumps or corrections happening on the market. If they don't want to get stress then be on point and focus on their accumulation since this is actually what we need to do.
There is no reason to panic about the volatility of Bitcoin's price, in fact, Bitcoin's volatility is just temporary fluctuations, there is no reason to worry about it, to achieve success from Bitcoin, you only need to buy Bitcoin in a systematic and consistent manner, it is not a big deal how much Bitcoin you buy, but the most important thing is how regularly you deposit Bitcoin.
Those who wait for a specific price to invest are definitely making a big mistake because Bitcoin's movement or its fluctuations can never be predicted, but if you wait to invest, you may panic later due to Bitcoin's volatility, so you may eventually give up.
So consistency is the best investment decision here, invest as much as you can afford to lose, and no matter how small the amount, the goal here should be long-term, and the investment method should be to deposit Bitcoin through DCA consistently, but it will definitely bring positive results.