Next year is always there for Bitcoin to pass $100,000 if it can not make it to that price this year and this is looking very not possible to happen. Bitcoin has a good side that when your target does not get pass, you can keep hodling it instead of selling and the target can be pass in the next year or more. People that want to sell at $100,000 should know that it is not going to be the highest price of Bitcoin for this bull market. Two things are likely going to happen, either the price of Bitcoin is not capable of passing that price or it pass it and continue to rise. The target should be more than $100,000 to sell because after selling, the next opportunity to make profits again is in the next bull market that will be happening in four years time therefore, anything that we want to do now should be down with perfection.
You are right that the chances of Bitcoin's price hitting $100k within this year are becoming slim over time. We only have about 3 months for the year to end, and the price is still below $60k at this point, and for it to hit that target, it will have to increase around $40k within 3 months which might not be impossible but it doesn't sound realistic to have that sort of expectations especially when we aren't seeing much positive movement in the market.
Talking about the selling points, I think every holder and investor will have their targets set based on their personal financial goals. Someone might have bought Bitcoin when it was below $30k and $100k is more than enough for them to take profit even if there are chances for the price to go above that mark.
I wouldn't recommend anyone changing their targets if they can't do that which means that if you need to cashout, you should do it when it hits your target instead of thinking of more profit and not selling because if the market crashes after that, you will only regret it.