I stopped getting followers when I posted bad memes.

Every nostr client will show you a different number of followers. The truth is, it doesn’t matter how many followers you have.

It only matter who you’re following

I haven't seen one, and I've tried most of the prominent clients. Of course I can't say I've every client, but I've probably used close to all of them. I've never seen that feature, but it would be cool.

The problem with displaying accurate follower data is the erratic and varying follower counts displayed by clients due to the way each of them pull the data. There's a few methods in use, and since followers are linked to various relays, what's displayed can be unreliable and inaccurate. That's a known problem that I've seen the devs discussing without so far devising a solution. I think that has to happen before a accurate history chart can be created.

Also, I'm not sure follow date is a piece of data that's associated with followers. If it isn't it would be real hard to create a historical chart even if collecting accurate follower data was fixed and reliable.

Ask first, is there a Nostr client that accurately displays followers at all?

I am not sure the value of the metric of followers at all. The WoT model tells you whether this person is respected by those you respect. All of the lurkers/Non-engaged/bot users are, for all important reasons irrelevant. Marketing, reach, dessemination, all fail by a "follower" stat.

I would push a Nostr client to create a Web of Trust scale. How many of the people in your web follow ALL of the people you follow. If every one follows each other, those webs are considered strong. If they are sprawling and few interconnections it would be a weak WoT. In the end you know if even one person in a strong WoT marketed or shared something it reaches EVERYONE.

WoT data is where it's at!