Based on the information given, my first remark is about volume/weight/amount of source material being processed. To illustrate, you could have done everything perfectly well and correct, however today's eWaste yield is so so so much low that you would've dropped one "grain" of gold. You would need a microscope to see.
If you have well over 500 grams of smartphone everything useful (mid to high grade, gold covered circuit boards, speakers, connectors, antennas, well, everything that yields gold from smartphones, you would expect to get 5g of gold in an approximation scenario. Do you know what is the weight and loose classification of your source material?
Since you mentioned your have recently started, it is very common to stack a lot of computer, tablet, phones, games, other electronics, sort everything out, see a bowl full of pins, poles, molex, flex, fingers, connectors, and other shiny stuff and assume you have a half ounce of gold from those 50 different devices you collected from friends, family, and neighbours.
Not really.
Assumed lot's of things, let me know your specifics to see if I can help
Cheers mate