If you're still taking the same dose of Tirz, your capacity to do that will be short lived and self limiting.
No one who achieved significant weight loss using pharma GLPs, and hit the inevitable plateau, stayed on the same dose and had weight reverse course in any of multi-year follow up clinical trials.
If you lost the last few pounds by willpowering your way to it despite a raging appetite, that progress may be lost, as it is in the vast majority of conventional diets. But the loss you achieved by GLP induced appetite reduction is durable, and if you start to regain weight, appetite suppression will return. If you continue to consume surplus calories despite the diminished appetite, side effects will also return to punish you for it.
Like I said though, if you have 10 more pounds to go, and appetite has returned, you'll need a higher dose for appetite suppression to return and take the pressure off. Probably one more level up is all that's required for 10lbs.