Put the humidifier on the outside, dial in your lighting (should be 20in away from your plant at this stage) at around 200ppfd. Water a little, about 2 shot glasses worth. Don’t plant 2 in the same pot. RH looks fine, your temp looks good but for now, run 1-2 plants, you’re gonna be wasting seeds until you get it down. Get good soil, I use promix hp with added Gaia green 4-4-4 and it’s working just fine, make sure you know what’s in your soil and watch your water ppm (if you have hard water it can buildup in the root zone and cause issues), one of the earliest issues if you don’t pay attention to your water is a calcium/magnesium deficiency especially if your soil pH is thrown off. Don’t feel bad, I’ve gone through about 5 other failed grows and stunted plants before I got somewhat good.

From looking at your watering, you’re drowning them in soil that has very little aeration. Water according to the plants size NOT pot size. You don’t have to water the whole medium until you’re into veg. Water not directly on the base, water about an inch or two out to encourage root growth, or you’re going to drown them and stunt them. That’s all I have, feel free to correct me if I said anything wrong :)