So from 260 lbs with a target of 180 to 200 lbs at 5'7" is start BMI of 42 and end 180 of 29. Could not find age other than a bit older so guessing 40's?
If you have not already , make sure you get a basic cardiovascular risk assessment, so blood pressure, blood sugars, hb1ac, lipids, liver function, kidney function. Mainly useful as the worse those numbers are, the more important it is to do something about it before damage occurs, and it argues for staying on GLP's long term. At a BMI of 42 the odds are you have metabolic syndrome, and are at high cardiovascular risk already, so you may or may not need statins as well.
I have yet to see convincing scientific evidence that lower doses or less frequent dosing works as a long term strategy for weight loss maintenance. In the context of a study with intensive support and follow up, you are going to get less weight regain after stopping or slowing down GLP's than in the real world without that extra support. And all the lower dose studies show weight regain, not as much as stopping it but still pretty substantial. The reality is much more long term studies on maintenance need to be done.
The only evidence I have seen for low dose weight loss maintenance is several people on this forum, and this is anecdotal, not clinical trial evidence and it is a highly selected, highly motivated group, and getting better than usual responses in such cherry picked data is not really surprising.
The long term, large scale follow up studies to the original studies on semaglutide and tirzepatide, show weight loss slowing , then stopping a bit more than a year after starting , and the weight loss being maintained on that dose for a further 4 years. My logic is further weight loss would happen if that maintenance dose was too high, and weight regain if that dose was too low, but with the dose used to lose the weight, weight was perfectly stable for 4 years. I think this is pretty solid evidence.
The other concerning bit of research was a mouse study where stopping and starting ozempic in mice produced much less weight loss than staying on it, suggesting that stopping and starting or the weight cycling process might make the drugs less effective in the long term. This needs to be replicated and shown in humans. study included. at this stage it is not obvious how to interpret this. If this turns out to be real in humans, which is not likely to be known for years, stopping and restarting after weight regain might be a bad idea.
The simplest approach is to lose the weight first, and once you have, then if you do not like the idea of being on them long term try reducing the dose very slowly, and keep an eye on weight, if it starts going back up, then if you do not want to regain the weight , then increase the dose.
I think staying on them long term is a good idea, especially at higher start BMI's like 40+, as diet and exercise are just not that good at maintaining weight loss in the long term, and GLP drugs are good at it, and at the same time reduce long term health problems like heart disease, stroke, diabetes and cancer. Trying to maintain weight loss long term by calorie restriction is hard and stressful, on GLP drugs it is not.