The way to bring more liquidity into BTC is not via ETFs, but with derivatives (futures/forwards…
Theo Winter

The way to increase liquidity for Bitcoin is to have more transactions on chain. We needed bigger blocks before last year. Maybe we will have them before the end of this year.

More people using and more uses of Bitcoin imply a larger market cap, more transactions stabilize the value as more people accept Bitcoin more it is difficult to have an actual sell off or bubble from daytraders and speculator with no skin in the game.

But more transactions and uses imply, also, a growing price for bitcoin.