To develop focus, it isn’t so much about eliminating distractions as it is to mindfully accept them and continue on. Life is distracting. No distractions could equate to no life. No one lives in a bubble. Even those in Covid-free bubbles are distracted by many things.
The important thing is to pull yourself back. As in meditation, when errant thoughts arise, just acknowledge the thought and then pull yourself back to the moment.
The same applies when building focus as a skill.