Currently, switching to GrapheneOS means giving Google money. Next year's Motorola-based alternative is also likely going to be several price classes above the Pixels you can currently put GrapheneOS on.
Then buy a Pixel second-hand or when they hit rock-bottom prices, which usually happens after 6 months or so. At some point Google is probably not making a lot of profit from the devices anymore and they want to sell it to you for tracking and to sell Google One subscriptions, which are mostly irrelevant if you use GrapheneOS.
Then buy a Pixel second-hand or when they hit rock-bottom prices, which usually happens after 6 months or so. At some point Google is probably not making a lot of profit from the devices anymore and they want to sell it to you for tracking and to sell Google One subscriptions, which are mostly irrelevant if you use GrapheneOS.