[sifar]

Instead of just giving up that you are not qualified to do so, you can at least do a preliminary analysis.

1) Follow the money - where is it coming from ? why would it keep coming in, what is needed ? where does it go ?

2) Competitors - who are they and what are they doing.

For your hypothetical farming tech company, find out about other farm tech companies who have similar product/market segment and look at their offerings, valuations and revenue model. If one does not have this reference point and doesn't have the domain knowledge, then one should not consider said opportunity unless one wants to gamble.