I want to tell you how to form new habits and replace old ones.
Most animals including humans have this thing called Trigger-Action Patterns. It is a habit of if <specific trigger has happened> then <do specific action>. Examples: there's a bowl of chips in front of you -> take one; you open your browser -> click on [you usual first click site]; you have arrived at [specific ttain station] -> go to [specific exit]. The last one often happens to me even when I intend to go in another direction simply because I used to travel that way often when I was studying at university. Basically whenever you making a decision and often even when you are not making deliberate decisions, there's a part of your brain which votes for the action you usually do in similar situations.

Here's how to use it to create Trigger-Action Plans:
1. Identify goal. I want to learn more English words and I have an app on my phone for that.
2 and 3. Choose trigger and new action. Whenever I bring my wallet with bus card to the bus payment device (this is the trigger), I will think whether now is a good time to study using the app.
4. Rehearse. If you can do it physically by getting into situations with the trigger, do it. Otherwise visually imagine you getting into such situation, noticing the trigger and doing the action. Rehearse for 10 times

Google Trigger-Action Plans to learn more.