@Ohmnomnom
It's difficult to ban screens as I have a ds5 as well, so banning cartoons in the morning would impact on him too and he's generally pretty good at following instructions.
DD gets to play Roblox at the weekend so I could take that away. I think I need to work on my patience levels and just keep repeating without getting angry.
Repeating might not help.
I think in some cases you need to be more specific. For example in getting dressed you could either offer her two (reasonable and suitable choices) like "right DD what are you wearing today? Leggings or jeans?" If she picks,great off she pops to put them on, if she faffs you just repeat leggings or jeans? It gets boring pretty quickly. Repeat for top if she doesn't automatically pick one, a lot of kids will keep going once starting.
Try with other things as well, two choices and being specific. For some kids it can be very overwhelming to have an open ended request and rather than asking what they should do,how,what clothes to wear etc they'll just avoid the task.
Try and end a request with a thank you rather than please. It works quite well(most of the time) .
Pick your non negotiables,like flushing the toilet. That's where you follow and nag every single time. "Don't forget to flush!" , "did you flush?" etc. until it becomes habit.
Teeth, make it part of the morning/bed routine. Again follow and nag for a while until it becomes ingrained. You eat breakfast ,first thing you do is brush teeth. You've had your pudding (even if it's fruit) first thing you do is brush your teeth.
Pick your battles . Decide what is really important and she must do and what you can let slide.
Clear,reasonable,immediate consequences when needed.
A lot of praise and rewards. Again praise is best to be specific ,so rather than "you're a good girl" use "thank you/well done for getting dressed so quickly" , "thanks for flushing, it makes it so mych easier for me to clean the toilet" and so on. Rewards can simply be attention, getting to pick what's for dinner , or with a job she likes to do, going to the park etc.
It's exhausting and hard work but you should see an improvement. I guess some examples might sound bonkers,but tailor them to your/her needs.