Try using NVidia Image Scaling on your 1440p monitor, you can keep the resolution at 1440p but set the NIS to 1080p. That would help achieve more FPS without spending money.
I use it at 4k resolution on a 3060(non ti) 12gb and it works really well. Use it along with DLSS in DX12 mode and it should minimise FPS loss while popping out panels.