A lot of people (including me) have transitioned to Jack’s 3-2-1: it’s probably the most economical nutrient line available. They are dry ingredients, you buy Part A and B and regular Epsom Salts (unscented) and mix 3 parts by weight of part A, 2 of part B and 1 of Epsom. PH to range (Promix would be 6.0) and TDS to 900 ppm. You can run that all the way through flower. If you need to add anything, some silica and cal mag would be good to have on hand.
I like Promix (peat) over coco for soilless and frankly you can outperform any commercial cannabis soil if you run coco or Promix. You do need a good PH and TDS meter.
Here’s my grow journal:
https://www.amazon.com/Jacks-Hydroponic-Nutrients-Fertilizer-Plant/dp/B08C3ZTJFL/?tag=greenrel-20