I would look into paleo diets like the autoimmune protocol(AIP), the idea behind them is that removing certain foods is a lot more important than adding them for that sort of condition.

Currently use a paleo/ketogenic diet to manage IBS, and fortunately blueberries (and other low sugar fruits) can fit into this sort of approach.

A family member has had amazing healing results with concentrated Wheat grass juice. Completely normal and healed with no medication.

The specific brand is Terrasoul Superfoods Organic Wheat Grass Juice Powder.

As a former UC patient, I would say that IPAA might be a good option if medical treatment is not effective for keep steroid-free remission.

Theracurmin is the best supplement for IBD I've found. But also do a biologic (Entyvio)

https://www.gastrojournal.org/article/S0016-5085(19)39702-1/...

I buy it on Amazon

As for drugs, nortriptyline helped me immediately (a few before bed for a while, then as needed) - cheap and safe drug. (Old anti-depressant, off-label for this treatment.) I also make some dietary changes (paleo-sih) which helped over time.

Quit carbs, enjoy the lack of UC symptoms.