I agree with Tomorrowman. 1tn USD by 2022.
Tesla will be a fully vertically integrated business.
Creating electricity (solar city), batteries, insurance, software subscription, manufacturing technology... The list goes on).
4tn within 10 years it's achievable.
I started buying Tesla stock in 2013. I have some in my ISA but it's mostly in my pension fund so can't access it yet. But, if all goes well I'm on track to comfortably retire at 57!
I also have a sizeable NIO holding. Their battery swap technology is awesome. Takes 3 minutes and the only charge is the cost of electricity.
Xpeng and li auto are two others to keep an be eye out for but they carry some risk. And as others said already, dont touch Nikola, fraudulent company. When they get in under the GM umbrella it might be ok, but high risk.
Also worth looking at companies that will provide the charging infrastructure for by the EV Revolution. Chargepoint is the world's largest charging network and they will soon be going public via a reverse merger with Switchback Energy. That's one to keep an eye out for. Could be a decent earner.