Don’t make it complicated, because it isn’t.
Financial net worth is an accounting term, and it’s equal to total assets minus total liabilities — very simple. Yes, it includes the equity value in your home, the surrender value of your insurance policies (hopefully zero in my view, but it includes that), the total balance across all three of your CPF subaccounts, and even the Carousel/eBay/Gumtree value of your household possessions and the clothes on your back, as examples. It’s just total assets minus total liabilities. (Liabilities would/should include any taxes owed if an asset were to be sold.)
Whether (financial) net worth is a useful measurement or not is a separate matter.
Liquidity is another separate concept. As it happens, too many people in this forum are focusing too heavily on liquidity. You don’t actually need that much liquidity if you’re properly insured (i.e. covering genuine insurance needs adequately, not including insurance luxuries and frivolities) and have an adequate emergency reserve fund. Moreover, liquidity is often very expensive. If you attempt to hoard liquidity as part of your strategy, you’re probably going to wreck your financial future.