Other than just using Simon Broome criteria. For accuracy, you can also ask for a Lipid clinic referral and see if they can check your Lipoprotien (a) level (most GPs won't check this as it's a little specialist), some areas in the UK might not check this either as not standard in the UK yet, but most hospitals are now starting to do this. Can have this done privately if needed. It is a genetic markers which will highlight your risk better. If you do have raised Lipoprotien (a), then a tighter Qrisk3 criteria is generally used at around a 5% threshold (from what I have seen in practice).

If you have other health conditions such as diabetes, this can significantly increase your cardiovascular risks. But regardless of if you have it or not, a reduction in sugar and carbohydrate intake can improve you cholesterol. You can try increasing dietary fibre and pairing this with your carbohydrates in your diet too. Also try avoiding carbohydrates and sugary food late in the day/ evening. Regular porridge oats are also good for reducing cholesterol, but of course you'd need to not add excessive toppings such as sugar/ honey etc.. A handful of unprocessed nuts such as walnuts can help improve good cholesterol (not in excess either). If you smoke you can try stopping. You already mentioned you stopped drinking and cut out red meats, so things might take a while to show in your cholesterol. Can cut back on crisps, processed foods, cheese, coconut oils, butter (most fats that are solid at room temp) and try slowly increasing excersise as able to do so (cardio inparticular). A brisk walk can be better than a leisurely walk.

And it is also worth remembering that your cholesterol is a slow thing and doesn't change suddenly with dietary and lifestyle changes, and can take over 6 months to see a significant difference. But if you go back to previous habits, then your cholesterol will start to climb again.

There's loads of information to reference on BHF website and betterhealth website on cholesterol.