The most efficient, in terms of minimum propellant, would be to use Sun's radiation and solar wind to slow it down and thus let the Sun pull down the craft. E.g

The most efficient, in terms of minimum propellant, would be to use Sun's radiation and solar wind to slow it down and thus let the Sun pull down the craft. E.g. big mirror at 45 degrees to solar radiation flux. This could take a lot of time, similar to your way.