First time making a sourdough loaf. I’m super excited!

Hi
I wanted to share my first sourdough loaf with you. I am familiar with baking bread with active yeast and a few years ago I tried to make my own starter which did not work out.
I got this starter last week from a bakery in DC and it’s super active.
I followed this recipe:

https://youtu.be/DiI-1PF_Mr0?si=yPW-jkdLy-Y4RJ-v

Ingredients
* 310 grams warm filtered water (90F)
* 120 grams active starter
* 500 grams bread flour
* 16 grams fine sea salt

Autolyse for 1 hour and then 4x stretch and folds 20 min apart. I did the bulk rise on my counter for about 4 hours, then I realized that it’s not doing much because my kitchen was pretty cold so I put it in the oven with the light on for another 6 hours or so.

I shaped it and put the dough in a bread basket covered with a plastic bag and let it sit in the fridge overnight.

In the morning I took it out of the fridge, put my Dutch oven in the oven and turned the temp to 450 degrees. After an hour I put the bread in and baked it with the lid on for 30 min. After 30 min I took the lid off and baked it for another 15min.

I’m super happy with the result and can’t wait to bake more bread. Any tips?