It doesn’t need any food, don’t give any nutrients in soil. Until you see deficiencies and those won’t come until roughly week 4 or later with a appropate sized plant.
Water should always be 6.5 for soil so bad PH can cause slow growth, however soil buffers PH so try to PH your water going forward if it’s over 150ppm.
Is the water clear of chlorine? A carbon rv filter or letting it sit out for 24hr will work.
Dont mist, causes more issues then it fixes. Water goes in the soil.
Dome your plant, young plants really need high humidity their leaf surface is sooo small it struggles to breath in dry conditions due to vapor density. Learn about VPD it will help you understand this.
5hr of sunlight is not very much for cannabis they need alot more but maybe you mean direct sunlight. It needs light for 16hr a day while growing at least.
Many people start plants inside or in a greenhouse and then transplant outside when they are bigger and stronger, your first shot looks like it’s outside?
Thankfully you have photos so you can have a veryong veg time and learn.
Your solo cups are so small that you will need to PH your water, it’s not enough soil as if it was outside in the ground, to buffer the water.
Also do not use Scotts Miracle-Gro it has nitrogen pellets in it that overload plants with nitrogen.
You want anything that doest say “feeds for 6 months!” or something like that your best bet is a local soil or an organic mix to avoid these issues.
If you have nutrients though I would suggest you get coco and perlite, growing in soil is slow and full of disadvantages like bugs as well as in the end you use nutrients anyways.