Sounds like you have a lot of catching up to do.
At least you know it, a good start.
You also know that MN for you, takes up too much of your time.
So sounds like you're off to a good start.
Just work every day on one project at a time.
Try to stay with one indoor project at a time; less mess and stress to look at.
Prioritise when you can; good weather, work on shed or plot.
Mostly indoors will bother you with less sunlight and holidays etc.
However you're not missing anything staying inside in the colder weather.
Clothes! Too many? Be brutally honest with size, colours, style, fashion, events.
(I have too many coats/boots!
Soon I will share with those who shop thriftily.
The hardest part of any job is getting started.
Once you do, it's easy to become obsessed with completing the task.
Which keeps you going. The rewards are obvious in tidiness & space well used
Keep your ambitions manageable.
Prioritise indoor de-cluttering this time of year.
Defer some (outside)projects, if weather, and daylight are important to work with.
Good to hear you're walking your dog, good for both of you to keep moving.
The more you move, the more you feel like things getting done.
Nice that you got enough money to buy new work shoes.
However, intending to do Vinted or car boot, will not get the job done.
Donate what you can, rather than putting off the process of Vinted and car boot especially,
Good luck, and yes, you have motivated to do same OP!