Portfolio Layout Feedback Needed

I have just finished building and deploying my personal portfolio with React, HTML, CSS and JavaScript, and it is now live at https://my-portfolio-eta-one-61.vercel.app/ (with the full code on https://github.com/r1c0000vinay-bit). My next goal is to refine its visual polish, so I need a fresh design-focused critique.

The area that matters most right now is the overall page layout and section spacing. Colours, fonts and other styling details can wait; what I really want is clear, actionable guidance on how to make each section flow, breathe and align better across devices.

Deliverables expected (ASAP):
• A concise review outlining what works and what does not in the current layout and spacing.
• Specific improvement suggestions, ideally backed by annotated screenshots or quick wireframe sketches.
• Any quick wins in React structure that directly affect visual consistency are welcome but not mandatory.

A fast turnaround is important—I would like to start implementing changes within the next day or two. If you enjoy analysing front-end presentation and usability, your insights will be put to immediate use.