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so my plan is to probably sell most of my Bitcoin
Hate to be boring or negative even but if the plan is just to sell and everyone has a similar plan can you spot the flaw in the plan to this ever happening
if demand is strong enough, it doesn't matter.
and when the bubble is happening, greed takes over. most people either sell way too low before price goes parabolic, or they wait until after price crashes out of greed. very few people get to sell the top.
Talking about greed, people will probably wait for ath and sell everything then the bubble will burst out. Hence, selling on top will br their goal. Demand will determine the price hence the supply and bitcoin halving will not be a factor for now.
Just note that we should know when to reap our profit.
greed means people wait for the best price to sell but that doesn't mean they don't sell on top or near it. if they didn't sell or as "figment" said only "a very few" people sold then price wouldn't have crashed at all. it is the sells of "many people" that crashes the bubble otherwise the price would continue rising.
note that things are a lot more complicated that this. the market dynamics is always changing and traders react to that.