Easy way to find whales is to see reputation, higher reputations usually indicate they've been around for a while and probably has some indication of their wealth, not always, but often they are positively correlated.
Second thing you can do is click on the person's name, and go into their "wallet", and then you will see what they have.
But always, focus on finding people with quality content first, things that you are actually interested in commenting on, and then comment in a meaningful way. But it helps if that content creator is a whale because those comments can be rewarded significantly even with a minor upvote from a whale.
But again its got to start with a genuine, sincere interest in the topic, then your comment will carry weight, and provoke conversation and followers.