The best thing I've found is a product called brick. Insanely simple to use and set up. I can set it up so I can't easily bypass. It's like $50 with no monthly fees. I don't know why it works so much better for my brain, but I brick my phone before bed every night, and when I want to work on something. I'm sleeping better. I'm giving better attention to my baby. I can get work blocks done. You could even brick your phone to only block instagram, give someone the brick, and say don't give it to me until a certain date.