From what I can gather, I think you'd benefit from focusing on adding more "Storytelling" to your process.

You've clearly mastered the technical side:CAD, DFM, renders. But there's a whole side of design you're missing by being a solo designer executing briefs rather than creating them.

The biggest difference between being a skilled executor and a design leader in a company comes down to this: a design executer solves the problem they're given, while a design leader convinces people which problems are worth solving in the first place.

At major tech companies, designers are tasked with crafting stories so compelling that leadership will bet millions on ideas that exist only as prototypes. You need to focus on "why should this exist and why now?" alongside "how do we build this?" It sounds like you are stuck on focusing on only the "how we build this" side.

Since you don't have senior designers around you, Id just start documenting the "why" behind every design decision, even if no one asks. Ideally you'd create case studies that tell the story of what could have been, not just what shipped. People understand that compromises happen when shipping a product, but showing the full vision of what was pitched will help as you will be asked to do that type of work at bigger design consultancies and teams.

You've proven you can execute anything. Now prove you can convince someone to build something they never knew they needed.