$Esperion Therapeutics (ESPR.US)$ Why can't I suddenly buy it? What happened?

Hi mooers!
$Walmart (WMT.US)$ is releasing its Q3 FY2025 earnings on November 19 before the bell. Unlock insights with WMT Earnings Hub>>
As of 14 November, share price of $Walmart (WMT.US)$ has risen +62.31% this year. Analysts estimate that the company's revenue and EPS would improve greatly for Q3. In the meantime, with holiday season coming, what revenue outlook would the management provide? Subscribe to @Moo Live and book the ...

$Direxion Daily TSLA Bull 2X Shares (TSLL.US)$ Is this considered stocks? Or etf? What is the difference between this and the tsla common stock?
If the volatility follows along with Tesla common stock, and its cost is so low, why don't people come here to buy this instead of buying Tesla common stock?
I'm a little confused, for example, buying this with the same 1000 dollars, the profit earned compared to buying Tesla with 1000 dollars is very different.
Is there any senior trader who can help me understand, is it because of any risks or management fees with this?

$Arm Holdings (ARM.US)$ Is now a good opportunity to buy low?

$Nikola (NKLA.US)$ Overall, this stock has been declining all along. Is there still a future for this stock?

Hi mooers!
$Alibaba (BABA.US)$ is releasing its Q2 FY2025 earnings on November 15 before the bell. Unlock insights with BABA Earnings Hub>>
Amid Trump victory, Chinese stocks and ETFs are sliding, as higher tariffs are anticipated. $Alibaba (BABA.US)$'s share price has been dropping ever since its peak of $308 per share in 2020. In the wake of recent Double 11 Shopping Festival competition in China, what outlook will Alibaba's man...

$SoundHound AI (SOUN.US)$ Good earning report but why stock is down post-market?