Bitcoin ETFs caused inflow of billions of dollars. We still have 21 million supply, Bitcoins are still mined every day and increased inflow of money means that more people are investing in Bitcoin and going to hold it. This means that Bitcoin's price is going to be stabilly high. If in past we had a price floating between 4K and 10K, in the next few years, Bitcoin's price will float between 50K and 150K. With Bitcoin ETFs and so much investment, minimum price is increasing. Years ago $1000 was a dream, remember that.
Growth needs time and Bitcoin Spot ETFs brought mass new capital to Bitcoin market from OTC market to Spot market, but people will need a long time to actually feel importance of the new capital inflow from Spot ETFs. They later will realize that there are and will be more demand to purchase bitcoin with time. If they sell their bitcoins at cheap prices to Bitcoin Spot ETFs and new Bitcoin investors, they will do things like sale-off without pressure from anyone.
It's only they don't have enough believe in Bitcoin to hold their bitcoin tightly and bravely for better profit even they are earlier Bitcoin investors.
Btw Bitcoin's price will be volatile again because it's the nature of Bitcoin, this coin is also easily speculated and I think it will stay this way for a long time. It might become more stable after a few decades when it will be very adopted and the market cap will be similar to gold.
Volatility is part of a live market, a beauty of Bitcoin market and one of most attractive things of Bitcoin market. Without volatility, Bitcoin market will no longer be lively and attractively enough to investors from traditional markets.