I am a practising medicinal chemist.
I agree with a lot of the comments here regarding treatments for covid.
All the big pharma companies will be working on a vaccine, and there are multiple technologies they are using to achieve this. As a result it is likely that they will all end up with one or more viable vaccines sometime in 2021.
State governments will be involved in this too and there will be plenty of collaboration between companies. They all know this is bigger than turning a profit, and a vaccine will benefit all.
Short answer is pick a pharma company you like the sound of, or 2. And invest there. Pharma is not going anywhere, people will always get sick, and there are always new diseases. Companies that have a large research arm can be seen to be riskier investments due to the high cost and risk of research. But gains can be big if a blockbuster hits the market.
There is an excellent blog called In The Pipeline by a chemist called Derek Lowe. He has a lot more expertise than me on this subject, and has a lot of accessible posts on the covid treatment pipeline. I’m sure you’ll get some inspiration there