A lot of these types of scholar and so called expertise in certain investment companies are trying to push Palantir share price downward by writing a great long thesis, and some investment company even sell their holding but later bought back again at higher price (no idea why). However, most has been proven they are wrong as Palantir price is continuing move upward and being rewarded by government for their services. 

No doubt the share price may drop heavily if one day Palantir do not meet the expectation, however, again it is short term impact as the key fundamental is still remain strong! Furthermore, smart investor shall apply "stop loss" to protect their capital or reduce their lost, and for sure shall not put their whole asset into one counter. Diversification is for sure one of the strategies in investment. 

Just one advice from my personal experience, don't over leveraging when the price go down as nobody how down it will be. So, ended you don't Have enough money to leverage anymore. to avoid big lost and long stuck of capital, 1st - Put stop loss to protect your capital, 2nd cut lost at a lost rate of 30% of your investment. With the secured Fund that you have, you could Go for another counter which could give you a chance of gain back.