I am assuming the metformin is 3x500 mg a day which is not maximun, dose. I am having problems with your readings.. Do you mean up to 10 from 7.1? And are they UK readingss? Only your doctor can prescribe medications for you since they have access to your medical records and know what other meds you are taking. A cocktail of meds is liable to have interactions and contraindications i.e. some meds will not work with others etc.
Before going onto insulin, you could try to get a c-peptide test to see how much insulin you are producing. If it is high, then going onto insulin will not be suitable, and you should in that case explore diet and lifestyle changes instead. Many of us here are insulin resistant, which means we have insulin but it cannot work due to high insulin resistance, so adding more insulin will make that worse. The Ozempic also increases insulin output, so if IR is you problem then Ozempic is not the best solution either. But Ozempic does also cause weight loss so that can help reduce IR, so it may work.
Trials on Ozempic showed that those with a BMI over 39 benefitted most, and did so by losing at least 15kg. If uou don't have 15 kg to spare, then keep an eye on the weight.
Are you sure it is one injection a month? It is usually a once - a- week med. Maybe the doc meant that at 4 weeks treatment the dose is usually increased.