Welcome from me also, yes just over the diagnostic threshold so with some changes you should be able to pull things back. However what you do has to be enjoyable otherwise it will not be sustainable which it needs to be so you will maintain your HbA1C in normal range of below 42mmol/mol.
The test you had represents the average blood glucose over the previous 3 months so it is usual to have another test after 3 months so you can see if the changes have been successful, it is not a particularly high level but high enough not to ignore and to take seriously.
Many have found a low carbohydrate approach successful and this link should give you some ideas for ways in which you can reduce your carb intake to a suggested no more than 130g per day, it is not just sugar but all carb convert to glucose.
There is good explanation and some menu plans if that is what suits you but you can just follow the principals and do your own thing which is what I did and reduced my HbA1C from 50 to 42 in 3 months.
https://lowcarbfreshwell.com/
An HBA1c of 48 is on the very cusp of the diabetic range or you could say at the very top of pre-diabetic range
If this is you first test you should under normal circumstances be given 3 months to reduce your score and then have another test to confirm diagnoses, which you should be able to do with some small lifestyle changes such as
1) Diet
2) Weight
3) Exercise
As an example, my first test was 51 just into the diabetic range, my second test 3 months later was 46 which is in the pre-diabetic range.
My aim was to control the controlables so in that 3 months I lost 2st plus in weight, increased my exercise levels and went on a low carb diet of less than 130 carb per day.
You certainly have no need to panic and with some small lifestyle changes be able to reduce your score to a more acceptable level
Many thanks for your advice I reallyappreciate all the help I csn get. Ì