Even if you do everything correct, including continuing to DCA invest into bitcoin for the next 8-10 years, it is not guaranteed that your investment will end up being successful.
Yes, bitcoin has been a good investment, and there is no evidence to suggest that bitcoin is no longer a good investment, but it is still not guaranteed to pay off, even 8-10 years or longer down the road. Each of us needs to size our investments accordingly, without anticipating that our investment into BTC is guaranteed to be successful, when it is not.
I do lay emphasis on this too, accumulation shouldn't be limited within 10 years or we expect to already make profit, even if we do, investing and accumulation should be taken as a life process and security for the future. Bitcoin is our digital gold and should be treated as a such not just for profit making sake. The goal should be sticking to your investment plans in a way you consistently invest without getting worn out.