The ENSO team has done a great job of modeling behavior of El Nino and La Nina, but have yet to have a predictive model that works in the spring. Even for the rest of the year the model is not as accurate as it could be.
In the ENSO blog I found a reference to an article(1) from 2019 about the forcing function of the moon tidal effect.
I happen to have been reading up on the prediction of eclipses which is extremely accurate, and so have interest in the orbit of the moon. The effect of the moon on tides is well understood and tides can be predicted with great accuracy. So far I have not seen any indication that your team is taking advantage of this information about the subsurface ocean wave in enhancing your prediction of ENSO.
I believe that your team is very busy and may have missed this comment on your blog. Thus I wanted to bring it back to your attention as I find this paper to be very compelling. Please read this paper and perhaps contact the authors for more collaboration. Feel free to contact me too. I would be interested in any discussion that ensues.

1.Switch Between El Nino and La
Nina is Caused by Subsurface Ocean Waves Likely Driven by Lunar Tidal Forcing.
Jialin Lin & TaotaoQian
www.nature.com/scientificreports s41598-019-49678-w.pdf