There are a number of trivial bounties that should be removed & replaced with bounties balanced around a longer completion time. The goal is to make bounties that are obtainable but not trivial, & to keep in mind the bounty refresh timer is (currently) 2.5 hours.
As an example, these are the existing carrot-related bounties at the time of writing:
$3000 10x Carrots
$2000 3x Carrot fries
A valid replacement would be a single bounty, with the combined requirements from each of the related existing bounties, in higher quantities, and with a slightly better reward compared to a single existing bounty.
Since the goal is to increase complexity, adding related items to increase complexity is also valid where it makes sense:
Ideally the new bounties will be valued at ~20% of the payout for one of the existing bounties that makes up the new one, though some related bounties may vary wildly in price, and this is not a hard number, just a guideline