Newbie in need of dank nug advice!

Loud Hello!! I am a new grower and I'm learning the ropes. I have made all the newbie mistakes and have figured out I will be growing organically from now on. I have stressed the hell out of my first plant with bad watering and improper overfeeding. I have flushed the big one many times and have added many organic amendments to try and build a soil biome for my plants. My second biggest plant is very dark green and I think its nitrogen toxicity, though it is my healthiest plant. Its growth is a bit stunted but I am flipping to flower tonight, I waited a very long time because I was trying to correct my big plant's deficiencies. Now that my soil is organic, I had a fungus gnat assault and murdered the shit out of them with a top layer of diatomaceous earth in my pots. I also added nematodes into the soil to battle with the fungus gnat population. I learned that to grow organic with much greater success I need a much bigger pot than 5 gallon, I will have to eventually move to 2 giant 15 gallon permanent pots in my 2x4 tent. Please give me any suggestions and comments, I really want to succeed on my first try and have thrown thousands of dollars at this obsession lol. Thank you!