Speaking as someone with a family full of inattentive ADHD, I can tell you that executive functions are HUGE.
My DS in particular has extreme impairments to his executive function (and like you, strong in visual spatial, weak in coding). That means planning, organizing, and managing tasks are all extremely difficult for him. In practice: breaking down a big task into smaller, manageable pieces; figuring out what to do first and what order for the rest; estimating a reasonable amount of time to complete anything; scheduling.... All of these are extremely difficult. Writing for him is also extremely difficult, because writing is really one big linear planning task. Just getting out the door on time is extremely difficult, always.
Most advice on how to organize yourself tends to be very linear, and word-based (think to do lists and essay outlines). For DS, we are always looking for more visual ways to do things, from pictures to mindmaps to flowcharts to GANTT charts. He also struggles with flexibility, is quick to declare things "impossible", and we work a lot on trying to reduce anxiety and open up to the possibility of finding alternative pathways forward.
There's no easy fix for executive function, but the more you can understand yourself, the better you can identify the things that trip you up and the work-arounds and supports that best help you personally. I'd recommend the book Smart but Scattered (for adults), as well as the website ADDitude (ADHD and executive function deficits aren't the same thing, but they overlap a ton). Cognitive Behavioral Therapy can help with the anxiety and flexibility as well as more general ADHD challenges.
https://www.amazon.com/Smart-but-Sc...63/ref=cm_cr_arp_d_product_top?i.e.=UTF8 https://www.additudemag.com/category/manage-adhd-life/getting-things-done/
