Note: often = frequently. Neither often nor frequently alone mean anything numeric. There meaning is relative. For example: “often/frequently” is more frequent than “seldom”
If there only TWO possibilities: (1) something happens, (2)something does NOT happen, then “more often than not” is anything over 50% of the time.
So if (1) happens “more often than not” it happens more than 50% of the time. However “more often than not” is no more specific than that.
(3) I often go to Avenida Chapultepec.
(4) More often than not, I go to Avenida Chapultepec.
For all intents and purposes I would use (3) and (4) interchangeably.
(5) I often go to La Borra del Cafe on Chapultepec.
(6) I often go to Cien Montaditos on Chapultepec
I do not, however frequent La Borra and Cien Montaditos equally. I go to both often but I do not go to both equally.
(7) When I am on Avenida Chapultepe, I often go to La Borra.
(8) When I am on Avenida Chapultepec, I often go to Cien Montaditos.
(9) In fact, when I am on Avenida Chapultepec, I go to La Borra more often than I go to Cien Montaditos.
(10) In fact, when I am on Avenida Chapultepec, I usually go to La Borra, not to Cien Montaditos.
Note: (9) and (10) are identical in meaning.
There are many venues on Avenida Chapultepec. The venue that I go to most often on Avenida Chapultepec is called La Borra del Cafe.
(11) When I am on Avenida Chapultepec you are more likely to find me at La Borra than at any other venue.
(12) When I am on Avenida Chapultepec, more often than not, I can be found at La Borra.
(13) When on Chapultepec, look for me at La Borra. I am there more often than not.
(14) When on Chapultepec, look for me at La Borra. I am usually/often there.
Note: The speaker can use usually and often interchageably for the same intended frequency or can use them differently for nuanced meaning. The language is that imprecise that it can be used differently by different speakers and even differently by the same speaker.
Note: (13) and (14) can be identical in meaning.