Hi, and welcome - it might help people to reply to you if you supplied some details - do you have diabetes, and if so, what type; what your A1cs look like; whether you're on medication or not, and if so what; what your lifestyle is like - do you low carb, or keto, or something else.
All of those might have a bearing on whether you might be prescribed a CGM via the NHS. Have you discussed a CGM with your doctor?
If you are based in England, I recommend reviewing the NICE guidelines which defines who is entitled to a CGM like a Libre.
I found this with a very quick Google search:
You should, maybe depending on your postcode, be able to get a prescription for one through your g.p. or be given one through your endo/diabetes specialists at your diabetic clinic at your hospital. If you don't have a smartphone, they may give you a sensor as well.