My first loaf, I believe it turned out fine?

Hello everyone,

here's my first ever loaf.
I cooked it in my Lidl Dutch Oven, and I believe it turned out pretty good, considering the anxiety I had after watching some underproofed and underbaked pictures.

Please share a feedback.

I've been watching all sort of recipes and videos online, created my starter 3 weeks ago and I was eager to test it.

I used some sort of variation of this recipe from the NY Times.
This video is great. Not only she uses grams, but also gives plenty of technical details.

I mixed the dough in a stand mixer, even if that's completely unecessary and everything can be done by hand. But I just bought it, so gotta use it.

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Ingredients (approx. for 1 loaf):

• 500 g bread flour (350g white + 100g whole wheat + 50g spelt)
• 350 g water (hold back ~20 g to add with salt)
• 100 g active sourdough starter (Refreshed with 1:5:5 ratio – 100% hydration)
• 10 g salt

Simple Sourdough Recap (with starter/levain):

1. Mix flour, water (save a little), and refreshed starter until combined. Rest 1h.
2. Add remaining water + salt, mix until dough comes together. Rest 30 min.
3. Stretch dough thin on counter, fold into a parcel (lamination). Rest 40–60 min.
4. Do 2 sets of stretch & folds in the bowl, 40–60 min apart.
5. Rest covered for 40 min.
6. Pre-shape gently, rest 40 min.
7. Shape into a tight loaf, place seam-up in a floured banneton. – Didn't have one so used a metal bowl with a kitchen rug. Worked perfectly.
8. Cover and cold-proof in fridge ~12h.
9. Preheat oven + Dutch oven without lid to 250 °C / 480 °F.
10. Flip dough onto parchment, score deeply, bake:

• 20 min with lid at 250 °C
• 30 min lid off at 220 °C / 430 °F

1. Cool at least 2h before slicing.

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Wife said that it tastes a bit sour, which I believe is correct, even tho I can't taste it ahah.
I can definitely taste the spelt, didn't know that was going to be so strong.

Is it correct that after cooking it the crumb is slightly sticky?
The bread is definitely cooked.

Any tips and tricks or way to make it even better next time?