If the US. government sell their bitcoins, it will cause selling pressure on the market in short term but price will recovery after dip.
If they sell and give you cheap price, it's your good chance to buy more cheap bitcoins. Your belief in Bitcoin is strong, or not strong enough, to buy that dip when it comes but I am sure MicroStrategy and Bitcoin Spot ETFs will not waste such opportunities.
What I worry about is that large-scale BTC selling behavior can cause BTC to adjust too much, affecting the market state and making technical analysis and on-chain analysis experience no longer effective in assessing the market state and making investment decisions. If the selling action is carried out cleverly to bring the seller the most money, the market will go through a gentle re-accumulation phase and continue to grow more strongly soon after.