Here are several ways to rewrite the title, emphasizing different aspects:

Focusing on Devin Booker:

• Devin Booker inks massive contract extension with Phoenix Suns.
• Booker secures $145 million payday with Suns extension.
• Devin Booker signs 2-year max extension to remain with the Suns.

Focusing on the Suns:

• Suns lock up Devin Booker with lucrative contract extension.
• Phoenix Suns commit to Booker, agreeing to $145 million extension.
• Suns extend Devin Booker’s contract with a 2-year, max deal.

More General/Neutral:

• Devin Booker and Suns agree to $145 million contract extension.
• Suns and Booker reach agreement on a 2-year, max extension.
• Devin Booker gets max extension from Suns: $145 million over two years.