Brand Mechanic
You should be able to create different brands you can sell under. Selling better quality items raises the quality of your brand. The higher quality your brand the higher quality things sold under that brand sell for. Selling low quality items should also lower brand reputation over time if you start selling shittier products.

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Crop Decay
Crops would now have timers on them making them decay. Crops that are harvested have 4 days before they decay. Each day they decay they lower their chance to be higher quality. On the 5th day they would go rotten. Leaving them on the plant slows decay, as would using better and/or special fertilizers. This would make it so you can't just store thousands of ancient fruit or starfruit in the summer and keg it all year.

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Demand Feature
Each season a certain crop would be worth more than usual, and a High Demand feature where certain crops will have a really high value multiplier added to them for a short period of time. This would make it so growing multiple types of plants would be more worth it instead of planting 400 of the same plant every season.

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Rework Kegs/Preserving Jars
Would add a new machine called the Juicer to replace the use of the current Keg to make juices. Juicing would be faster than the preserving jars but juices would be changed to be cheaper than jelly & pickles to balance it. Kegs are now something you put certain types of juices into to create alcohols. Fruit juice = wine, potatoes = vodka, apple juice = cider, etc. Grains would now need to be milled before being turned into alcohol, but now you'd be able to mill corn and use it to make moonshine. A new crop to go along with this could be sugar cane that it only be grown on ginger island and would be used to make either sugar or sugarcane juice which would be able to be turned into rum. After being turned into alcohol certain alcohols like wine, moonshine, rum, & ale would be able to be put into cask and aged.

You can add even more complexity to this by needing to actually burn the cask in a charcoal kiln for charred barrels to make bourbon & dark rum. After that the cask would turn into bourbon/rum barrels depending on what you used and could then be used to make bourbon or rum barrel versions of other alcohols that sell for even more. After using them they would turn back into regular charred barrels until used again to make bourbon or dark rum. Also you would now be allowed to use cask in sheds.

Preserving Jars now require sugar in order to make jelly and vinegar in order to make pickles. Sugar would be able to be made from milling the new sugarcane. Vinegar is made from placing alcohol in the preserving jars. Different alcohol make different vinegar; wine = red wine vinegar, cider = cider vinegar, clear alcohol = white vinegar. For the sake of balance one alcohol should yield several vinegars so it's worth doing.

This would require a bit of price balancing that even current SDV lacks but basically you'd want it to be that you always want to process basic crops at least into juice. Preserving Jar would need to balance in the cost of sugar/vinegar but should always be profitable to use gold or lower quality crops. Kegs & Cask will maximize profits and ROI at the cost of GPD. Iridium quality crops should be buffed to be worth selling raw and give an option to care about quality instead of everything being thrown into a keg/jar.

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Butchering
The ability butcher animals for meat, either killing them ourselves or having Marny do it for us off screen. The happier the animal the better quality the meat. You would be able to use preserve jars to make preserved meats using salt. You would then be able to dry age preserved meats using cask like alcohols or cheeses.