Homemade Edibles Not Working

As the title says, my homemade edibles aren't working and I'm not sure why. I've tried making firecrackers with organic peanut butter and nutella, cannabis milk, coconut oil and butter and none of them have worked for me. I've been decarbing at 250 degrees F for 20 minutes in foil and it always comes out an dark toasty brown color in my toaster oven. I know edibles work for me because I eat store bought ones every night and get high so it's strange why my homemade edibles aren't working when I'm following the exact directions I've seen on edible recipe websites and youtube videos. I've even tried making ABV edibles (vaped at 375 degrees F on my Volcano and Mighty) as well, I infused 15 grams of ABV in a half a cup of coconut oil for 4 hours and put the oil in brownies in an 8x8 pan, ate two large brownies and nothing happened.

I really wanted to get into making edibles so I can make my own medicine since the usual edibles I buy from dispensaries are pretty expensive. So any advice and tips will help out because I really want this to work!