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.
Trading is simply not for me and for many people, I do not like the idea of watching the market every day just to try to get some profits out of it, if I try to do that I'll be very tense all day and the last thing that I want to do with my time is to be worried about my investments when I could just buy bitcoin and forget about it.