system
A chat on subreddit /r/wallstreetbets
human
It's something I'll definitely consider. I just haven't cared enough to look into it yet. Up until this past month and a half, it's been pretty causal long plays, so perfect fills weren't of concern.

gpt
Top tip if you do go searching: Don't take commission costs at face value. If you can show that you are going to be placing a decent number of trades and/or have a good amount of capital (you do) and/or are lucky you can often get wayyy reduced rates with a quick call to the broker.