1) Create a hierarchy
In the example below the higher tier package takes up twice as much screen space, the font size is larger, and the button color is primary. It doesn't feel right pressing the “Buy Now” button on the lower tier.
2) Offer a more compelling discount
If you want people to buy the more valuable package why not make the discount more compelling.
In this example the higher tier package is reduced by $100 (or 40%). The lower package is only reduced by $20 (or 25%).
3) Use tier names to set expectations
Look at the name of the higher tier option. The Complete Package implies that if you choose anything less you're missing out. It could just as accurately be labelled The Bonus Package but that wouldn't have the same psychological impact.
Some of you may recognise the image from Refactoring UI by Adam Wathan (IH Podcast). He's made > $2.5M selling online courses.
I've wrote a case study going into detail on how he prices them. This is an excerpt. If you get round to reading it, please do let me know your thoughts in the comments :)