Any advice for mosque imams and Friday preachers?
Yes. Mosque imams are in fact guides and teachers.
They are teachers, so they must fear Allah ﷻ.
They should lead prayers and preach as required.
Seeking reward, they should be patient with hardship.
They should choose topics that people need and present well.
They should present them well to the people.
They should give great attention to the Friday sermon.
What is meant? Not words that are spoken and end.
What is meant is speech with meaning and benefit.
The Prophet ﷺ would preach with a few blessed words.
And they would affect the Muslims.
It is not about the sermon's length. It is about its topic.
And about the sermon's impact. That is what is required. Yes.