Do you have the same concerns about water or food? Why does it matter that it stops benefitting you if you stop taking it?
Water and food have a milder risk profile. The FDA (https://glp-1.health/blog/glp1-obesity-eligibility-bmi-chart...) recommends "GLP-1 weight loss medications (Wegovy, Zepbound) if your BMI is 30 or higher, or if your BMI is 27 or higher with at least one weight-related health condition such as high blood pressure, type 2 diabetes, or sleep apnea". This is because there are side effects such that GLP-1 meds have not been shown to produce a net positive benefit-to-risk ratio for people who are only mildly overweight.
It's possible to secure those independently in a wide variety of scenarios. It's harder to DIY your own GLPs.