It's either pick from the usual Fidelity funds or go IRA and have the ability to pick stocks as well as funds. Given that option why not put 100k or even 200k into TSLA stock? Hindsight is 20/20, could have bought years ago but I figure I'd be saying the same thing 2-3 years from now. Of course a new car or boat is tempting. LOL
You seem like a non-regular visitor here, so I'll offer some "not advice" that is probably obvious to the regulars, but maybe not to you.
TSLA will almost certainly be higher in 2-3 years. By that time, three more factories should be ramped up (counting Shanghai Phase 2) and probably more factories being built... Autopilot will be trained by Tesla's super duper computer Dojo... Tesla Network (robotaxis) will be either rolled out or clearly showing its gargantuan potential... Cybertruck will be driving Ford toward bankruptcy... exponential sales growth of Solar Roof and Powerwall and Megapack will no longer be ignored by analysts... and world-conquering $25k "world cars" from China and/or Germany will be unveiled or ramping up production.
Billionaire investor Ron Baron predicted TSLA will reach $2k/share by 2025. I suspect it will get there sooner as the forward-looking market sees all the above and realizes Tesla is only getting started. The only question is whether the price will drop on the way and give you a better entry point than $600.
Nobody knows for sure, but I doubt it. The FUD is flying now like Gordon Johnson's spittle (including this gob of snot), but the recent upgrades from Goldman Sachs and Morgan Stanley are a hurricane blowing it away. Some folks here expect TSLA to drop after S&P500 inclusion (I don't), but even if does, it will likely drop from a higher point and maybe not reach $600 again.
Standard advice is invest half your cash now and half later, but I wouldn't wait too long. At least 15% of available shares are about to disappear permanently into index funds, and every day brings more YouTube videos showing the awesomeness of the Full Self Driving beta. And you never know what that tricky Elon will announce next.