All the bio named products have added microbiology to them, which is why there are a bunch of different types of sugars. The seaweed and key extract have I bunch of different plant growth regulators along with an abundance of trace minerals. The use of humic and fulvic acid are to chelate the nutrients so the plants can uptake them easily.
If you don’t want to go the banana peel route I would get some potassium sulfate to add to your mix. Later in flower the plant hold onto as much potassium as it can get. Sulfur is a precursor element for most terpenes .
Cheapest way IMO to make a bloom booster would be to make a ferment of banana peels, pumpkin, onion, and carrots. You could throw some garlic in there too for added sulfur boost over the onions. But this takes some time for everything to ferment and brake down.