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.