Hey there Bullmark, i see you think the soil is "almost depleted" but it's far from it. first off you've actually been feeding, seems like too little but then again, it's soil, so it doesnt need much. Second the plant is doing well, you dont need to worry about nutrition until you hit flower. I use top feed dry nutes, i like that system better because you can measure out the nutrients quickly and cleanly. But in your case i would go for liquids just because it's easier to figure out . I would wait longer, the get flowering nutrients, calmag, and humic acid as an additive. folks are surprised what a huge difference the right nutrients at the right time can make. Hope this helps 🚀