I quickly adapted and this barely slowed me down. I recommend the following iOS apps:

1. Jomo - you can create block lists of distracting apps. Like OneSec, when you try to open a blocked app, it makes you wait 5 seconds or more. More importantly, on that screen, you can select 5 minutes, so that it only gives you 5 minutes of unblocked access.

2. Brick - a physical device with an NFC tag you put somewhere. Block all the distracting apps on your phone. If you want to look at them, you need to physically scan the Brick with your phone to get back in.