First sourdough loaf

Recipe used: https://alexandracooks.com/2017/10/24/artisan-sourdough-made-simple-sourdough-bread-demystified-a-beginners-guide-to-sourdough-baking/

I've gotten comfortable enough making yeasted breads and finally decided to get into the world of sourdough. It split down the sides, but I'm otherwise happy with this being a first attempt.

There were several steps in the recipe that required personal choices. I went with 100g of starter, completed 3 rounds of stretch and fold, and the first rise was about 7 hours on the kitchen counter (room temp probably about 70F). Second rise in the fridge was about 12 hours. Followed baking instructions, but probably could have left it longer without the lid because the crust is still a little soft on the top and sides, but the bottom was starting to get a little dark.

Any feedback and tips or tricks for the next loaf are appreciated!