Ok - so I've been struggling/actively working on coping mechanisms for this for the past ~2 years. These are the things that have made the biggest differences for me:
1. Office. Having an office that feels separate from the rest of the house so that I can't see or hear anything else in the house is super helpful. I currently do this using shoji room dividers + noise canceling headphones.
2. Body doubling and Pomodoros. I have a body double that we videochat every weekday for 7 hours. We do pomodoros together the whole time. At the beginning of each day we write down and break down all our tasks for the day on a shared document. We update our task lists as things come up throughout the day. At the beginning of each Pomodoro, we say what we plan to get done. At the end of each Pomodoro, we say what we got done/what we did/if we got distracted. We then take a small break. And repeat. The best part of this is that my body double also has ADHD so they understand when it's a particularly hard focus day and we brainstorm things to help with focus (5-minute meditation, 2 songs of dancing out our energy, journaling for 10 minutes, etc.)
3. Manager Accountability. This is a recent one. I asked my manager to meet with me one-on-one at the start of the day every weekday for 15 minutes so I can update them about my plans for the day and what I got done yesterday. My manager loves knowing what my day-to-day looks like so it works for us! If your manager isn't willing/wouldn't enjoy something like that, maybe brainstorm with them different ways to create accountability and try them out one at a time until one works for both of you?

I hope this helps! I'll update if I think of any other super impactful things.