You don't need to fixate on a specific number. Look at where you are now and figure out if this is the right weight or if you want to weigh less or more than your current weight.
There are a lot of things to consider, but to generalize, how do you feel and look at your current weight, and how sustainable is it? If everything is good now, congratulations! This is your goal weight. It's probably not that simple because it can be a bit of a balancing act, but figure out, overall, if you'd be better off losing more weight or staying where you are.
Are you physically comfortable, able to be as active as you'd like to be, and have good mobility? (Of course, there are factors other than your weight that affect these things, but consider whether losing more weight would improve these things.)
Are you satisfied with how you look, what size clothes you wear, how people perceive you? Do you look healthy or do people often ask you if you're sick (which may indicate that further weight loss would be a negative for your appearance)?
How easy or difficult is it for you to stick with your current calorie level for the long term? If you're hungry all the time and struggle to stick to your plan, you may be setting yourself up to fall off the wagon and regain. If you're satisfied with what and how much you're eating and exercising to maintain your weight, it's sustainable for the long term.
How are your health metrics? How's your blood pressure, glucose, cholesterol, etc., and would losing more weight be likely to improve anything? Do you have any vitamin deficiencies that indicate that you're not eating enough (or not taking the right supplements)?
I would take the numbers from your dietitian and GP with a grain of salt because bariatric surgery patients are different from their average patients, and without specialized training, they may not understand the nuances and may be basing their advice off the good old BMI chart. In my opinion, if they are giving you a specific number as a goal weight, or telling you that your weight is "too high" or "too low" based solely on your height and weight rather than your actual health metrics, they probably don't have great knowledge in this area. The bariatric dietitian will probably be more helpful. I know you have to wait a couple of months, but you seem to be doing fine for now, so unless you have major problems, you can probably just keep on doing what you're doing until then.