Short of donning a tin-foil hat and going to live in the woods, it's practically impossible to completely isolate yourself from all vulnerability to data snoopers. However, there are some practical steps that anyone can take to improve things.
Haven't used google search in ages. Also use ublock origin to block all trackers on mobile and PC.
Haven't seen a targeted ad yet or to be accurate haven't seen an ad in the past 4-5 years.