@vijaysingh1784 Looks like you have done a bit of research your self and made a pretty good analysis. I am not very familiar with MojoAuth, but just to confirm a few things:
FusionAuth is very customizable. You should check out things like Lambdas, Webhooks and other various options.
FusionAuth can be self-hosted or can be hosted for you.
FusionAuth handles SAML, SCIM and other various integrations.
FusionAuth is very scalable and gives you great control with api acess and other mechanisms.
Depending on your needs, FusionAuth can be as easy to self host as spinning up a docker image to a full blown complex K8s deployment. It should fit your needs there.
While there is no direct migration guide for the product you are talking about, there are several other migration guides for you to look over that should give you an idea on how to do it.