I don’t have 5 years to wait while I lose 30-40% with the idiots we have running the country the next 3 years. Did I say idiots? Yes I did. The most incompetent administration in history.
Typically markets don't crash violently because of a government policy, so if that's your concern that's driving you to seriously consider making moves because you anticipate a massive decline....that's not a reason that's happened.
Actually, all of the major 40% drops have happened primarily under Republican presidents in my lifetime.
1987-Reagan
1991-Bush Sr
2000-Clinton
2001-Bush Jr
2002-Bush Jr
2008-Bush Jr
2020-Trump
More importantly, there's typically a global reason vs bad policy that is the reason for the crash. Typically those global reasons are from bubbles popping (1987 Savings and Loan deregulation, 2000 internet followed by 9/11 followed by a confusing war, 2008 housing bubble from deregulation, 2020 initial Covid reaction).
That being said, inflation particularly global inflation is something that could kick off some serious selling pressure.
Anyway as Twenty and Jamie said, if you're really concerned you can buy put options to kindof freeze/hedge your account without selling your current position (even though you'll need to pay taxes when you sell your hedge) and if you're right and the market crashes you could potentially make more than what you're going to lose on the way down.
My simpleton investing advice is to keep things simple with easy entry and exit levels. For example, buy an ETF based on it's price from two years ago. When it crosses below, sell it. When it crosses above, buy it.
Simple and boring.
Gets you in the market during run ups, gives you enough space to endure minor corrections but gets you out when it capsizes.
If you don't like the capital gains tax then move to Puerto Rico (which doesn't have a capital gains tax and gets away with it being a US territory vs state).