It no longer matters. Today's stonk market is in no substantial way connected to the economy any more, it's really just a casino now.
To fix it, major structural changes would need to happen. Things like sales taxes on stock transactions, bans on short selling, bans on algorithm-initiated trades, bans on leveraged-anything, prohibitions on different 'classes' of stock, and many more would be necessary.
I think the easiest and most quickly effective would be the sales tax. It would immediately reduce liquidity, which is really the biggest problem the market has right now, and it would be potentially a decent source of revenue for the federal government going forward.
And yes, market liquidity is BAD. It should be harder, slower, and more expensive to move into and out of owning stock. The entire reason stocks exist is to allow a company to gain funding from people who think it's going to be a long term success, not as a casino for 'making' money by moving money.
Or we can continue to have a stonk market that's casino only vaguely tied to anything related to the economy, but that still effectively serves to increase wealth inequality.