You can also try adding fish balls (can find at Asian supermarkets). Another is Napa cabbage - it sounds quite plain but is surprisingly good in a hot pot. Also try getting a fish based bbq sauce (it’s a Taiwanese brand), and mixing that with sesame oil, soy sauce, chili oil, ginger/green onions/cilantro/garlic, finely chopped. For noodles, I would use udon, hands down. Lastly, adding steamed rice to the broth at the end with beaten egg to make a congee is excellent.