That’s scarcity mindset and it decimates your potential for negotiation. If you really truly believe you are a commodity and have nothing at all to offer compared to any other candidate, it’s worth either learning something new to get out of that commodity category and/or look at your experience + knowledge outside your core specialty and market that better.
It sounds cliché but there is nobody like you. We all have unique experiences (life + professional), hobbies, knowledge no one else has or at least not in that particular combination. That’s your « unfair advantage » as some call it and you absolutely can use it to your advantage.
The choice is yours.