A word is a part of speech, not a sentence like the one in your example.
verb
The full stop at the end.
An Adverb. Reason it ends in '-ly'. e.g. He ran breathlessly to the bus stop.
He said that long speech because he wanted slavery to stop
The word stop is a regular verb. It can also be a noun as in (e.g.) a bus stop.
No, speech marks do not end after a full stop. In British English, the full stop is placed inside the closing speech marks. In American English, the full stop is placed inside the closing speech marks when it is part of the quoted text, and outside when it is not.
He said slavery was wrong and should stop.
Here stop is a verb. verb + to + verb - plan + to + stop
The word "stop" can be a verb or a noun, depending on how it is used in a sentence.
Stopped is a verb (past tense of stop) and an adjective (a stopped car).
You can't stop using "speech" in your story. You might think that there is to much speech but speech is how you talk. So the answer is no you can not stop using speech in your story
Tell her to pack a lunch!