If you can see yourself carrying on for at least five more years you could do what I did .... enter the Metric Century a Month Challenge. That would get you sixty 62-milers and almost at an Eddington of 62 even with just one effort per month. In my case, like you, I am now stalled on my Eddington No. of 63 as I never really aimed bigger than that. Even my Metric Eddington is now stuck at 93 as I just don't feel I have any more metric tons in me. The various Cyclechat challenges are an excellent way of improving your Eddington by thinking long-term though.
Cheers mate - but the 50 score I'm talking about is for 2024 rides only. My overall Eddington Number is 73 at the minute.