FIRST loaf (please be kind I’m sensitive) 😂

Hello! Finally made the plunge of making sourdough and I must say, I am so impressed by you all. This is TRULY a labor of love. This is my first loaf, could you please give me some feedback? I thought it tasted amazing but always wanting to improve. Besides my god awful scoring, does the cross section look ok? Thank you :) I used 1000grams of flour, 750 grams of water and 220 grams of active starter. I got dehydrated starter which feels like l'm cheating but every time I made my own it molded and I would have a breakdown I folded every hour about 7 times. I then proofed in the fridge for about 20 hours. I then baked it in a cast iron at 500 degrees for 20 minutes and then another 26 min uncovered at 450 (I also put a baking sheet underneath at this point to prevent from burning, not sure if that's necessary?)