Long-term investment will help you build a risk-free investment and you can earn a lot of Bitcoin.
The DCA strategy of accumulation doesn't kill the risk in bitcoin investment, it only gives you an opportunity to continue buying more bitcoin for yourself regularly and grow your bitcoin portfolio to a size that you wouldn't have been able to accumulate with your consistent and persistent DCA for 4-10 years and above.
Aren't you contradicting yourself here mate? DCA strategy gives you the opportunity to accumulate and expand your portfolio by the amount you wouldn't have been able to buy at once since you may not have a large discretionary income ready to frontload your investment. Furthermore, it helps smoothen the effect of volatility on your investment by creating an average buy amount between the highs and lows you must have bought during your ongoing accumulation journey. DCA is lenient and mounts little or no pressure on the investor and he is able to sustain his regular buys with as much aggressiveness as he can without overdoing it while he keeps drawing closer to his accumulation target within his holding period.