Collocations for monologue - noun

inner, interior, internal
extended, lengthy, long, rambling
short
comic, dramatic
opening

deliver, do, go into, launch into, recite
She delivered her monologue in a deadpan voice.
an entertainer who does comic monologues

monologue about
She launched into a long monologue about how wonderful the company was.

monologue on
He went straight into a rambling monologue on the state of the country.