What every plan should look like for each investor should depend on their goals. However, I consider buying through DCA as the best method for now if the goal is to hold the investment for a longer time. This is because the price will go down and will also go up from time to time, but it mostly goes up in the long run.
DCA never gets old and it's the strategy that the majority of us is aware of. What we need to plan is to get on how long we're going to hold the bitcoins you've bought. If you have no exit plan, that's just fine and you can get some portion of it when you want to and sell it at your will if you need some extra cash for some purposes that you need to spend it.
DCA will be the most used method especially that majority of us can't buy bitcoins in bulk then people will go use this strategy since they can buy their bitcoins on regular intervals depends on when they can afford to do it. I think planning to sell well depends on situation and the needs of the holder itself since if he feel that he need to cashout something then they must sell their profits nothing can stop them or tell that its wrong since that's profit already they can earn that back since your balance left will still generate you a profit and also you can do your interval accumulation once you are ready again to accumulate.