While the above does what you ask, in that it will net you the 10k you are looking for, I would caution you that what it won't do is give you the level in Farming which you need for scarecrows to protect your produce from those foul feathered felons, the crows. With 10k in cash, you'll be able to buy 200 Potato Seeds, which means you could be losing up to five crops per day to them, which is simply unacceptable. Thus, I propose a slightly modified tactic to cater to your specific needs.
Don't sell your parsnips, plant your original 15 parsnips to net you Farming 1 on the evening of Day 5, meaning you can make the Scarecrows on the 6th, just in time for your potatoes to go down. With this in mind, also don't sell your coal, as you'll need one per scarecrow, and you'll need a couple to cover all your crops. You'll also want to hold onto your fiber, because they cost 20 fiber each. This is going to put a very substantial cramp in your finances, you'll need to be lucky on your first couple of days to get everything needed to get your Fiberglass Rod and Bait before the end of the second day, but it can be done.
Given each potato sells for 80g and there's a 10% chance of an additional potato, we can give a rough estimate of (200*88=17,600g) total. This does not take into consideration those potatoes which come up with a higher than normal quality, which are a bonus on top of that. With that in mind, you can purchase 176 Strawberries at the faire.
Given each strawberry sells for 120g/ea, that's (176*120=21,120g) per harvest, with two harvests remaining in the season for just over 42k in your pocket rolling over into summer, purely and exclusively based on strawberry sales alone, and assuming all strawberries are of normal quality. Additional quality strawberries simply increases your profits. Not too shabby, really. Should get you started on your Hops production, since you've unlocked Kegs by this point. I hope you remembered to start your oak tree stand tapped in the spring, because you'll want a LOT of kegs. Two kegs per hops keeps up with demand and will drown the world's sorrows in Pale Ale, almost enough even for Pam!
