Fifth attempt, first good loaf!

After 4 failed attempts, I finally got something edible! My first four attempts I had weak starter, and completely under proofed the bread. I feel like I finally got something to be excited about! By no means perfect, but was really excited to see this when I opened the oven!

Here’s what I did, curious on ways to keep improving?

300g water
100g starter
450g bread flour
10g salt

Mix all ingredients together, let sit for 30 mins. Then I did 4 rounds of stretch and folds every 30 mins. After that, I let the dough sit for about 6-7 hours. I then pre-shaped, let bench rest for 30, and then final shaped, placed in my boule, and rest in the fridge overnight (about 12 hours). Then next morning I cooked at 500° for 20 mins in the Dutch oven, and 15 more mins with the top removed!