It doesn't matter whether you buy or sell btc today. It's going to slide sideways for a long time, will remain around 2500-2900 for years to come. Just look at the market cap, $50 billion currently. It means, for the price to double, another $50 billion have to come from outside. It's a huge amount of money. No way the btc price will double any time soon. Your best bet is to buy when it's 2500 and sell when it's 2900, repeat, rinse and repeat again. You can thank me later.
You are dreaming, a few years at 2ks. It will either go up big or crash down, bitcoin has NEVER gone sideways for a few years. Especially after a huge leg up following a long bear market. Look at the charts what you are saying is totally unpredented.
Following your advice may work a few times, until you buy at $2500 and the next day it's $1500 and going down hard after that.