It sounds silly to mention, but for a person just in remission, it's hard to identify what helps since progression of the disease is not very visible. Fortunately enough, but it would be good to get on track with a helping diet.
I've avoided mentioning this too much in the comments because I didn't want to seem to be advertising this, although for full transparency, I feel that I must. It's just what I feel is the best best... I've also started (very) high-dose vitamin D, so-called "Coimbra protocol", which really needs doctor supervision which I don't currently have but will promptly.