I've been meaning to try Zitatel which apparently have unique feature of being able to act as LDAP server, that might be one option
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If you want something lightweight, you can also use KanIDM instead of Authelia + LLDAP. It supports LDAP, OAuth and RADIUS.
And, like LLDAP, KanIDM is written in Rust. Projects like Authelia and Zitadel are also fast but they still use a garbage collector that kicks in every now and then.
Like other people have suggested, maybe it's a good idea with better featured options supporting many more authentication and authorization options.
My personal pick is Authentik as it supports working as an OpenID, SAML, RADIUS, LDAP, and proxy. While also supporting external users from the likes of LDAP