As a 5 years of experience i tried every method for waiting optimal profit. Waiting just with a hold of any coin is not very good at short and mid-term time intervals. Generally holders wait for historical rise but it comes in 3-4 years or maybe more. So even if you wait for that rise you can gain something on short and mid-term time. Basically i assume you have some coin just sell some of them on a small rise period, price is moving with 6k-8k for a few month so when you see 7-8k prices start to sell dont sell all but some of them should be great. Even if it rises after you sell you are now waiting it to fall , and short time period it always falls just wait 1-2 months low and buy even if it drops more you basically gained profit. So if you can read some trend moves you can invest mid-term so you dont have to hold for years. If price starts to rise historically then it is time to buy.
This strategy is really nothing new, you're just holding most of your coins and you are using a small amount of money to trade, the strategy can be effective and it can give you money but for a long term holder it is just a waste of time, it is true that in order to get the full benefits of of holding for the long term you have to do that for years but that is something that long term holders have accepted from the beginning.
The problem with long-term holding is that it works until it doesn't, whereas short-term trading works most of the time, and still more so when long-term holding is showing promise too. When you are set to hold long term, you may not actually know whether you will ever be able achieve what you are looking for. If you won't, which is altogether possible, then it will be such a waste of time than all other short-term wastes that you speak of will look infinitesimal and absolutely insignificant. In other words, long-term holding can be either a phenomenal success or a catastrophic failure.
While short-term trading coupled with long-term holding allows you to account for much of the unwelcome developments.