I use longs plots to farm. I'll get my rested bonus and eat 3 stamina foods (typically muckshake, turnip soup, and onion soup). If you start 1 meter away from the front and side edges of your cultivated spot the first plant will stay healthy. Then walk forward ready for the next plant. The ghost will remain red until the space is far enough to ensure a healthy plant at which time the ghost will turn green. If you try to plant while the ghost is still red you get a "need cultivated soil" error even though the ground is cultivated. (If you plant walking backwards the ghost turns green immediately and the plants are too close together to remain healthy).

I use 3 planting beds 4 tiles wide by 20 tiles long. At the end of the row I'm just about out of stamina and I walk backwards to the start edge of the bed and my stamina is fully recharged. You can start the next row about 75% of a tile away from the previous row and plant the next row and all plants will be healthy. My 4 x 20 tile beds will support 5 rows of healthy plants and I can plant 300 seeds in about 10 minutes.

https://steamcommunity.com/sharedfiles/filedetails/?id=2857321032

For fishing I discovered that you can fish from a boat or raft (Karve seemed to work best for me). You can sail or paddle to a location that has many fish nearby so that you don't have to make a long cast (8-10 meters is enough) and you'll use much less stamina and will be able to bring fish in faster.