Hmm so some thoughts, take/leave what you like and happy to chat more as have recovered from childhood trauma and used to be scatty/overwhelmed with stuff like this!
You probably need ‘systems not goals’. Little routines that you do regularly that help you stay on track. That could be weekly/monthly time to sit down and do your finances. Weekly half hour for random admin tasks etc. Life admin really doesn’t take long when you do it regularly. Don’t feel you have to tackle it all at once. See if you can make it a habit to do a few bits weekly. Set a reminder on your phone.
Start a to do list on your phone and add to it whenever you remember things.
Self sabotage is actually self-protection - you might be protecting yourself from feeling difficult things. Do you procrastinate? Procrastination can be a way to avoid difficult feelings. If we don’t do the task, the feelings don’t come up. So it’s really avoidance of feelings. Dr David Maloney is great on procrastination - he’s a trauma informed psychotherapist on YouTube. And it can be avoidance of good feelings linked to the past too - eg ‘if I do this task I’ll be acing life and then I’ll outshine sibling/parent and they’ll be mad at me’.
it could be that:
Facing the tasks = facing the feelings = awareness and processing of the feelings = recovery/healing
so there could be massive positive payoffs for you if you can try little tasks, explore what feelings come up and repeat. Baby steps.
Before you need to do a task that you keep putting off, you could try journalling. Some questions to think about - What are you afraid of? What feelings do you worry will come up if you start doing the task? Are you afraid of interacting with people to get the task done? Etc.
Practically, it might help to shift your thinking into gamification too. Detach a bit from the fact that these are your finances, your tasks, that there’s consequences for you etc, and turn it all into a game instead. Set up spreadsheets for tracking money and tick off teeny goals and to do lists. Find the dopamine hit from filling in a spreadsheet or whatever method floats your boat.
Do you have skills from work that you can harness for home? Eg can you set up a spreadsheet, manage a small project? Could you view your home life as a mini work task and think about how you’d tackle it if you were being paid to do a job?