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.
First and foremost for newbie or existing bitcoiners, the first thing we should know is that bitcoin is a long-term investment and the next thing is our plan in achieving the long-term goals, if we can position towards this lane I think deviating from it wouldn't be an optnon for us, the major problem many people have in their bitcoin journey is the ability for them to understand the concept of the investment and thereby concentrating on the main thing without any form of deviation, with the little i know, some persons allow themselves to be influenced with what they hear without making good findings about those stuffs.
Differentiating between trading and Bitcoin investment is not difficult for people, is just that they have been entangled with quick money mindset so at that point retracing their step doesn't seem easy because of addiction if what they have chosen, this is more reason why we should be focused from the begining in other to avoid being misled by our instinct or what we hear from the so called traders, there words seems convincing but practically zero.
For me, the goal is to continue accumulating Bitcoin because the future is more brighter than what we are seeing now so instead of chasing those shitty unrealistic goals it's better for us to do our thing gradually with ease and less stress and hodl for a long-term.