I've actually been following your other thread and thinking about responding but not quite getting around to it.
1. I am not a fan of doing what you love for work. Doing what you can accept for work, sure, but trying to make money from what I do for fun, drains the fun out of it, as you found with hunting and fishing. (I've found this to be true for writing fiction, crafting, and food, not saying it can't be done, just that I didn't like them as much anymore).
2. You say there is a market for fermentation. I assume you know that since there is some market activity for it. What can you offer that is different? Would clients be willing to move from the current product to yours? What niches are waiting to be filled? How does this fit with legal requirements about licensing, food regulations, etc?
3. Similarly, with landscaping- what could you offer that is not being offered right now? Are there people who are still looking for landscaping services, considering the current economic situation? What makes your product different? How does that fit with equipment you might need to buy/finance/etc?
I'm a big fan of observing. Observe patterns and see where you can fit in to take advantage of need that exists. Running your own business involves risk and stomachaches and, occasionally, spending a shocking amount of money when there is no guarantee you are going to make it back (this past year has been disastrous for my husband's business, and the salaries still had to be paid. We've got backups and further backups and even more backup plans, so we've been okay. But still, there have been some sleepless nights). Do your due diligence, research first, it's the most important lab report you're ever going to do. Then sit down with people whose opinion you value and see what they can add.