Patience and a long view. Computational understanding only has much value for your child at multiples >= 3x of their current age. Right now, the primary value will be spending time with you and you sharing your interests with them. Good luck.
That is the true value to your child - to give them an entire new perspective on problem solving, that help them to realize their own performance is not a thing to be judged, but a result to be improved.
I'm NOT a math genius (or any kind of genius), but it went from being unapproachable to being totally learnable.
I believe it's probably most important not to force your kid to do anything and just guide them in a direction and let their interests shape what they spend their time on. Most peers my age grow up with a pure dread for math and science disciplines because it was forced on them throughout their whole life. For me, it's still painful to think about anything related to chemistry/world history because I just remember a sure dread while taking the course (although that probably had more to do with the course/how it was taught than the actual content).
I don't think Python's Turtle is the best way to go here because it is difficult to build on the skills learned while mastering Turtle. Plus, nothing that will be built ends up being that impressive (whereas HTML/CSS can make awesome things). Scratch is probably a pretty good way to start just to get them to think about how specific problems could be solved.
If they're super into science and math, it may be beneficial to play with Mathematica.
If they're interested in games/VR/AR, check out Unity.
Beyond that, I follow the new-crowd here and would start with Python. The syntax is much better than other languages and it captures many of the most important features in programming languages. There is also phenomenal support for Python packages.
I remember doing really basic 'mods' for Morrowind (like a chest that asked you questions - it was written in the flavour of C++ that the game engine used) based off a tutorial.
For me this was a really interesting and engaging way to get into coding, and I think that's often the biggest hurdle for kids - keeping them engaged.
The visual blocks, sounds, and some plugins like musical notes make it a really fun approach creatively speaking.