If they actually want to survive long term, there are two paths as I see it:
A) Be legitimately better than AMD, this could include opening up the management engine, much higher performance chips at lower price points, or some sort of space magic utilizing their Altera acquisition.
B) Embrace RISC-V and push it to laptops and desktops HARD, while not pulling the Microsoft Embrace Extend Extinguish™ play. If they go this route then their stock becomes an exceptionally strong buy IMO.