I would tend to agree with Mededcannabis, his 5 steps for your plant are pretty spot on. Good compost is very rich in nitrogen, phosphorous, and magnesium without the time release fert added because of the decomposition process and can be very damaging to fledgling and early vegging plants in large quantities. I would get it out of that compost asap if you want to prolong its life. A good bag of organic soil should only run about 8 to 10 dollars, I use Natural Gardener & Bloome ($9.25 for a 2ft^3 bag at my local nursery), just look for an organic non-ferted soil. Hope it goes well for you

Could you post a full view pic of the plant as to get a good perspective of it's overall development?