Actually you can set a plan with DCA accumulation every week more consistently for long-term targets. If I look closely at the point you made where you are not mentally strong enough to hold bitcoin long term, I think you should be able to strengthen your mentality to face sudden market reversals. In long-term investment you must have a strong mentality, not panic and continue to buy regularly, your cash flow must come in every month so that the investment you make can run smoothly as you target.
People who are not mentally strong in holding Bitcoin for the long term still have to train themselves more in dealing with every market condition because they are not actually trading, but rather collecting Bitcoin in order to become more because the goal itself is investment. I also really understand what you are saying because some people still need to separate investment from trading when their goals are quite clear with a certain duration of time. And now I am still motivated to buy Bitcoin when I see the Microstrategy company that continues to accumulate and buy more Bitcoin at the current price. Because they really don't care about the price of Bitcoin when they only focus on their goal of collecting more Bitcoin ownership for now.
Common feelings for people doesn't have any solid directions towards what they really want to happen with their money ready to use for some useful things. If they could figure out and gather good information about doing long term investment and eager to learn more about it then provably they would be heading in good direction.
But some people want to take a risk since they want to experience the other means on they could earn money. Also for sure that once they tried trading and feel the pressure and how risky to participate on this activities for sure people would just drop that idea of doing trades since for sure that they would can't handle the continues risk since it give them a lot of stress everyday. Good thing that there's good institution just like what you have mentioned that people can look forward that its good to hodl bitcoin for long term since this could give them convenience and more realistic results compare if they adapt the pressure then get burned in at the end. So trading must be avoided since there's nothing sustainable matter we can really on in this option.
Bitcoin investment is very much better and more preferable compared to trading, it's better to continue buying Bitcoin and be patient for years than risk my money into a short-term means of making more money, which could drain my portfolio in a twinkle of an eyes, trading has very high risk and chances of profit is 50/50 compared to Bitcoin that offers very high chances of profit if you follow the right investment process which is buying and holding for long-term. a wise investor would risk their money in a more safer and profitable way of making more money, even if it requires profiting in a longer period instead of to risk losing everything a short-term.