Hi and welcome
The good news is that your BG is only just out of normal range, and given the usual allowable error in measurements, might possibly not even be out of range at all. It's possible to make rapid changes to BG levels by changing food types - that worked for me and for many others on this forum. I only wish that someone had told me when my BG hit 43.
To put it simply - your blood glucose levels are rising because your insulin system is not able to cope with the levels of glucose arriving in your blood, mainly from digested food. Glucose is produced when simple sugars - such as sucrose, fructose, or lactose - are digested, and also when carbohydrates are digested. Carbohydrates are essentially long chains of sugars, which break down to glucose. There are many possible reasons why your insulin system isn't coping, but rising BGs shows that something isn't right.
Regular fingerprick blood testing with a glucometer will show how well your body deals with glucose produced by the food you eat. A rise in BG levels after eating carbs is normal and to be expected - non-diabetic people usually see BG levels return to around starting point by two hours after eating. However those people whose insulin systems aren't coping would usually see higher levels for much longer than two hours.
It follows that if you reduce the amount of glucose arriving in your body, you'll give your insulin system more chance of dealing with what does arrive, and also for your system to maybe recover a bit and work better in future.
So what does this mean in practice? It means cutting back on foods that contain large amounts of carbohydrate. This includes cereals, root vegetables (mainly potato), bread, pasta, rice, pastry, anything sugary or sweetened with sugars, etc. This website has some useful guides:
At the point I started my BGs were a fair bit higher than yours, and I also had a lengthening list of nasty symptoms, so I reduced my intake to 20g carb/day. That's roughly the carbs in one apple, not that apples feature in what I eat. Result, normal BGs for me in four months.
I wouldn't expect that you'll need to do anything so drastic. Some people find that they achieve what they need on 130-150g/day. You need to think honestly about what you eat, and look at where you can maybe start to reduce carbs, and see what the impact is.
Best of luck. This forum is a great resource and please ask as many questions as you like.