I take a number of steps to obscure my identity from advertising/surveillance networks and data brokers, and I know ultimately they'll still have profiles on me that are probably extensive.

Don't give up! Even if failure to prevent some data collection is inevitable, we can all help reduce the aggregate value of shadow profiles assembled by advertisers:

Block all ads. The bits that cross the threshold onto your networks and devices are yours to display or not. Anyone who tells you otherwise is a petty tyrant.

Help friends and family to block all ads. React to ads in their homes and on their devices the way you would to nonconsensual, graphic, violent pornography.

Keep blocking ads and tracking even though you know shadow profiles built about you continue to exist. It's only partially about confounding surveillance. It's also, and equally, about changing culture.