We often procrastinate because we're overwhelmed. So with seeking an adhd diagnosis, your faces with quite a few steps (guessing at what these are) - finding out how, making a GP appt, filling in forms, etc etc. Write down the steps you need to do to achieve X and by breaking it down into smaller tasks that can be done separately it becomes less overwhelming and more doable. Your adhd brain will find these small tasks easier to focus on without getting distracted.
I write a weekly to do list. Then each evening write a daily one for the following day, using the weekly one as a guide. You can go as basic as you like. I actually write things like laundry and loading the dishwasher on. I would probably do them anyway but there's something about ticking them off a list that gives me purpose and structure.
For cleaning, or any activity really, keep what you need where you need it. If wiping down the coffee table involved walking into the kitchen, delving into different cupboards for cleaning spray and cloths, you're less likely to do it. Whereas if all you have to do is reach behind the sofa, or wherever, the task becomes smaller and simpler.
5 minute tidies like others have suggested. I do a similar thing with decluttering - every day I just deal with 5 items from whatever box or corner I'm organising or tidying. Much less overwhelming than doing the whole thing at once.
Cut down on phone use and social media, in my experience it just feeds adhd tendencies!
Personally I find that taking a decent fish oil supplement really helps.
Routine is key - I'm not great at this but where I do have it, it works.
Everything needs a home. Tidying becomes less scary when you know exactly what to do with every item in question.
I'm not diagnosed adhd but am as certain as I can be that I have it. So I'm no expert here. But these things work for me!