Yearly certificat renewal - other way?

A beginner question, that I hope someone can help with

We have a inhouse app(an .Ipa file), that we sign with developer cert etc and deploy through MDM
Every year it is the same "nightmare" that certificates has to be renewed, and even this year also the overall distribution certificate must be renewed.

Is there a way to find a different solution, so there is no need for all this renewal every year?
If I put this into appstore connect, I guess the apps will be published in appstore ? - but will the yearly new signings then be gone or ?