It’s true that Biden really put her in a corner. She hasn’t really been able to differentiate herself in a meaningful way, and maybe that was strategic. It’s not that uncommon for vice presidents, but usually there is at least some distinctive role or signature issue that the VP works on.
Biden acted as an informal whip in Congress and as a diplomat in some international issues as VP. Pence acted as a media surrogate to the religious right, and as an advisor on appointments. I think he was once considered the most powerful VP of all time.
Harris reminds me of Veep, the Julia Dryfus show. I can’t recall a single signature issue or import role she has played in the past four years.