Not necessarily. When you get to the target weight, you don't need to go straight from the dose you are on to zero, you can, and probably should, lower the dose little by little, just like you raised the dose at the beginning of the regimen. If you are at 2mg, you first go to 1mg, see if your weight is stable, then if it is, go to 0.5 mg, then 0.25 mg. In the near future there will be oral versions of the GLP-1 antagonists, to you will be able to fine-tune even more precisely the dose, for example, you could figure if you can skip some days.
The body has some "weight memory". But I heard this memory disappears after about 10 years. If you take Ozempic for 2 years, go in very low dose maintenance mode for 8 years, and then stop taking it, but keep an eye to see if you need to start again, what other dieting option offers you this type of choice?