imo, I would use the style(s) that best match my needs/ fancies/ whims and enjoy the home.

Before selling, I would consult with a trusted realtor (or 2) and make the minimal changes necessary.

You should design your house the way that you like because you are living there. Having more than one lighting style in various rooms is fine and actually makes a lot of sense IF the remaining furnishings in that room also go with it. For example I would not mix late 1950's modern monofilament lighting with arts and crafts furniture. Crystal chandeliers are pretty versatile and go with about any style furniture except the starkly modern.

You may want to engage the services of an interior decorator if you find it hard to stay with a theme in one room.