What is the best way to invest in ETH/ETH 2.0 right now taking into consideration the transition?
Don't invest in Ethereum 2.0. Until the launch of Phase 1, users will not be able to create their addresses and send transactions.
So far, the Ethereum 2.0 network consists only of validators.
If you are offered to buy Ethereum 2.0 somewhere (before the launch of phase 1), then most likely they want to deceive you.
All smart contracts will work on Ethereum 1.0 until Phase 2, so buy Ethereum 1.0