I’m not sure now that a national marketing campaign would do much good, I think clubs need to market better in the local area to get back lost fans.
My local track is Oxford, now when I buy a ticket I need to input my email address. I have never received any email from them advising me of what meetings are coming up or asking me how my experience was. They must have thousands of email addresses that they could reach out too and have so many potential customers they could contact in one easy way with offers to get them to attend again.
I will say the information they supply on the WhatsApp group is very good though.