First thing i would say is that you should not get into watering on a scedule. How often a plant needs water will change throughout it's lifetime based on many factors and you will always get better results if you learn to water/feed when the plants need it. Once a plant is out of the seedling stage I can usually tell when it's time to water by picking up the pot. When it is dry enough to need water it will feel noticeably light. I see that you also have meter that looks like it reads soil moisture. Those can be a useful tool if they are working properly, but try to use it to learn how to identify when your soil has dried out without it so that you won't have to rely on it going forward. Any kind of meter can stop working, require calibration, or just run out of batteries. Besides crappy lighting, over/under watering and over/under feeding are the most common problems i see with new growers.
Also, in soil cannabis tends to prefer a pH range of 6 to 6.7 give or take a bit. Most decent soil will do a good job buffering, but when i water (and especially if I'm using nutrients) i try to keep the water in that range. Consistantly watering/feeding with water that is way outside that range can eventually overwhelm you soils ability to buffer and lead to lockout and can also negatively impact the beneficial microorganisms in the soil.
I can't say if any of these things will be helpful to you as I don't have enough info on how you grow and what you do and don't know, these are just areas i see a lot of newer growers make mistakes in. Good luck in the future and never stop learning.
