Slimming World doesn't work for me

Hello There
I need to find a new very simple diet as am in the obese BMI category, prediabetic and have raised cholesterol. I am in my late 60s. Also I remember the late 1960s!
I have been following slimming world food optimising for a year now but only lost 17 lbs in 52 weeks.
I love the support and the meetings but their eating system does not work for me. I am following food optimising 100% but now often gaining pounds instead of losing them.
I am thinking of continuing going to their meetings for the support and companionship but following a different system for eating. SW just encourages me to eat unlimited amounts of certain foods, but without a reasonable amount of fat the food doesn't satiate me and leaves me with constant cravings ( remember K D Laing?) and low fat diets make me feel depressed. I would rather follow a diet where I eat normal healthy food but in small portions.
I have a slow metabolism and an addiction to healthy tasty foods. Plus I like to have a sandwich when on the go and although I eat meat and fish I only want to eat small amounts of these to prevent suffering to others and help prevent climate change. I need to curb my appetite and stop leaning on food to make me feel better in general.
Any advice for an ultra simple cheap diet of every day foods? Or any other suggestions. Has anyone tried hypnosis? Any good free or cheap apps that are simple to use?
Thanks so much in advance for replying and sharing your experiences.