much for your palate to take (not everyone handles pickled/fermented foods), than go with prebiotic options

Dandelion Greens, Sunchokes, Garlic, Onions, Asparagus, Leeks, Cacao preferably unsweetened, Jicama, Seaweed.

these guys contain short-chain fatty acids like butyrate, acetate, and propionate which enables the gut bacteria to produce nutrients to sustain your colon cells assuming you have enough probiotic in your system already this food is food for those bacteria.