Looking for advice on AI-driven development

Greetings! Hope you're all having a marvellous day! I'm looking for some guidance, as I feel like I'm hitting a soft roadblock. I'm not technical, but my work experience comes from working in software development companies for many years. As such, I'm familiar with many development processes, which seems to be helpful. I've spent the last six months learning and slowly building my own app, moving from simple vibecoding to spec-driven development (using Claude Code in VS Code). However, as my app (a cataloguing app based on React, TypeScript, and Vite) gets more and more complex, and the tasks seem to eat up more and more tokens, I keep getting a feeling I might be doing something wrong. For example, Claude prompts me to run /code-review in a loop sometimes, and I'm not sure if that makes that much sense after the second or third time. I keep reading guides and digging for new knowledge (at the moment I'm trying the whole subagents thing), but it starts to feel like I'm chasing my