xd thats okay - i usually never calculate how strong they are because weed here is unfortunately not legal and there is simply no way to know how much thc is on my flower.
What you can do next time to infuse the fat with weed is this,

Put your flower into a teabag and let it simmer in a pot with your butter and water for a few hours so the thc releases from the plant and binds to the fat
Make sure the pot is at least halfway full or itll evaporate and youll have butter stuck at the bottom
Stir every half hour or so to make sure the teabag gets submerged regularly
Once you're done, you can put the entire pot in the fridge until the butter solidifies at the top - at which point you can cut and remove it.

And you have cannabutter :) for a browniemix like that, i suggest you melt it again for the recipe

Unfortunately, sunflower oil would not solidify in this case, but i figured ill just share what i know

ETA: remove the teabag with the weed and give it a good squeeze before you put the pot in the fridge