Soluble fiber like in carrots, black & blueberries, bananas, summer squash, green beans, etc. Not just oatmeal.
https://www.verywellhealth.com/best-ibs-friendly-sources-of-soluble-fiber-1945020
I have a form of IBS which makes it hard for me to process insoluble fiber.
Milled/ground Flaxseed is a good source of soluable fiber, I put it on eggs and mix it in smoothies. It becomes almost gelatinous and my system really does well with it.
Other things I can eat are cooked collards, spinach, and zuchinni. I can eat all the foods you listed but I have to soften the carrots.
Green beans. My next-door neighbor, elderly, IBS-D and diverticulosis — she swears by green beans, discovered they are just about the only food that works on her gut problems. She has a bowl of them for breakfast, keeps her normal. Metamucil didn’t work for her, bananas made matters worse. Ditto avocados.
I wouldn’t want to eat green beans for breakfast, but I guess it beats long visits to the bathroom.
All my senior friends have gut problems. Every last one. I have learned a lot from doing their grocery shopping.