What do you think, is there a liquidity crunch and it makes sense to sell now because sellers will come in soon to take advantage of these high prices? Or does it make sense to just hold at this point?
Hold.. Hold... $100k is certain in this bull market that has already started. The market might still pull back a little after all this pumping, or it might not. So, it's better you just hold and set a target price to sell in factions. Since you bought at $21k, you already have a huge profit now, but don't rush to sell off so you don't regret it by the time you see the price going above $70k.
I mention selling in fractions; yah, what I mean is, you can set about four target prices and the fraction of bitcoin you will sell when the price is reached. For example, you can set to sell 0.5 BTC at $80k, another 0.5 at $90k, and so on. Remember that the peak of the bull market is not yet reached, and it could happen next year because this year the price will surpass the previous ATH.