Why does my homemade sourdough bread consistently sink in the middle and how can I achieve a perfectly risen loaf?

I totally feel you - it can be super frustrating when your bread doesn't turn out as expected. I've been there too, and I've found that sinking in the middle is often due to underproofing or overmixing. When you underproof, the dough doesn't get a chance to develop the air pockets it needs to rise evenly, and overmixing can kill the yeast and make the dough dense.

One thing you might want to try is checking your proofing time and temperature. Make sure your dough is at room temperature (around 75-78°F) and that you're giving it enough time to proof - usually around 4-5 hours for the bulk proof and 2-3 hours for the shape proof. Also, take a look at your mixing technique - try to mix your ingredients just until they come together in a shaggy dough, then let the dough rest for a bit before kneading. This can help prevent overmixing and give your yeast a chance to do its thing.

I'd also recommend trying a different shaping technique - sometimes, the way you shape your dough can affect how it rises. Try using a gentler touch when shaping, and make sure you're not over-tightening the dough. You might also want to try using a bench scraper or a dough whisk to help handle the dough more gently. And don't worry if it takes a few tries to get it right - sourdough is all about experimentation and patience, and it's totally normal for it to take some time to figure out what works best for you.

Lastly, don't give up - you're clearly passionate about baking, and with a little practice and patience, I'm sure you'll get the hang of it. Keep trying, and don't be afraid to experiment and try new things. And if you're still having trouble, feel free to share more about your recipe and process, and I'd be happy to try and help you troubleshoot - I'm always up for a bread-baking chat.