How migrate my data from Erpnext v11 to new Fresh Erpnext v14 installation

Hello,

I use ErpNext for a few years and I never updated my Erpnext Installation I’m still in version 11 :

ERPNext: v11.1.30 (master)
Frappe Framework: v11.1.28 (master)

And I would like to have the new version v14.
I looked to upgrade v11 to v12, to upgrade v12 to v13, and v13 to v14, but I don’t find anything really clear and I feel more like I will kill my ErpNext instance and lose everything.

V11 was installed with bench method, not with a container.

So, maybe it will be easier, to begin with, the new fresh version v14 and insert my old data in this new ErpNext, but how can I do that?

Thank you