Solana to $1000 is likely given that the market cap is still rather low.
$300b market cap is very possible for SOL because SOL is a good project, has a good team, and social following/mentions. The more people become aware of Solana, the faster this coin will grow.
The development is what the investors really like to see, with how Sol managed to bring good updates
that market cap is very likely to happen, maybe not that quick as there's no need to rush things out
but the chance is always there if the project really has good potential.