Can I forward my land line to my cell and keep my existing cell number as well?
If you have a phone capable of having 2 eSIMs, I think so? Not quite enough of a techie to be sure.
The following link will guide you through this process. https://www.verizon.com/support/knowledge-base-181139/ ~Geo
Doesn't that support article only apply to mobile lines? The OP asked about forwarding a landline to a mobile number.
