Assigned row 1 with basic. Can’t store my personal item now?

First time doing Basic and got 1E. I did basic because I was doing a short weekend trip and just needed my backpack with 2 days of clothes and work laptop and didn’t care about seat.

So are my only options that someone nice will let me put my backpack under their seat behind me, hope the gate agent lets me change to another available seat for free, or pay for another seat?