Weightloss is a two part process, though realistically its more like 1.5 but the 1 is like a lifestyle thing. The biggest thing is your diet. You need to change what you eat, when you eat, and how you eat. Im not saying super crazy keto diet stuff (dont do this btw, its really hard on your body). Dont go without eating too, just eat less overall. Maybe one less meal a day, smaller portions, avoid butter as much as you can. Dont eat a lot of carbs. Eat more vegetables. Get proper sleep and sleep at reasonable hours. Make sure you eat no later than like two or so hours before you sleep so you dont develop acid reflux. Be sure to hydrate too and lay off any other drinks, alcoholic or not. Its a lot to do but thats majority of what could be contributing to your weight.
If you wanna also work out thats good too. You dont need to do anything crazy, some laps around the block every day are a great idea and are easy on your joints. If you have access to a swimming pool i strongly suggest that. Do laps. Swimming is insane for working out.
I wish you luck OP. Remember, when you hit your goal dont stop. The diet thing is a lifestyle. You will regain what you lost.