The long-term holders have a big contribution as well. If all long-term holders sell their Bitcoin, I think the rice of Bitcoin probably suddenly drops in the market because of the increase of the supply. Well, all the parties basically contribute to support the Bitcoin ATH.
In my perspective only long-term holders are having big role in building new ATHs; buyers and sellers are having their own reasons to do so but whenever there will be less number of sell orders then we will have huge rally which will end up in setting up new ATH. So, the role of long-term holders must be vital. If we need to thank shorters are providing liquidity then we must treat in the same way for longers as well.
There is a good amount of miners who are making money right now. The "base" income for all miners is daily 50 million dollars, if they keep selling 50 million dollars per day every day, that will drop the price for sure, if they keep some of that it will not impact. Obviously the crypto world is much bigger than just 50 million dollars and we can recover that, but it is still a good chunk of money, put the transfer fee's on top of that and they might be making a huge amount of money per day.
This is why I think it is quite important to realize if they are selling right now or not, if you have 80+ million dollar sell pressure from miners, it is going to take 80+ million dollars just to break even that day. Which is why I know that whales matter a lot, but miners matter even more as well if you ask me, what they do decides what the market will do.