God, am I really the right person to offer advice? Probably not, but here goes.
I would recommend writing a "white paper" laying out as briefly as possible the issues you're interested in. Then try to imagine what characters you need to explore those issues. Like, an issue might be that farmers are out of touch with international commodity price fluctuations (!), if you're dealing with cash crops. Well, then you might have a farmer who is actively trying to get information about that on-line and is adjusting his crop accordingly, or one who has a bumper crop of something that has suffered a severe price drop – or is about to have a great year because of a rise in prices. If you have a character or two around each issue – and better yet if they overlap – then you can illustrate the issues by following their fortunes.
That sounds very mechanical; but the more you get interested in the individuals you have identified in this way, the more you will find them, and be able to make them, engaging even independently of your issues. And then your audience will care more about how the issues affect them.
That's how I would go about it, anyway. But issue based films are not really what gets my juices flowing, which is why I suggest getting deep into your characters.