Don't treat it as a diet because that immediately becomes restrictive.
MayB think about how your bodies requirements have altered over the years. Until 20 years ago I could eat most things, in the last few I've stopped croissants, scones etc. as they would cause several bloating and nausea . Probably due to hidden fats and sugars.
Baked beans etc. are out due to bloating! I cannot digest eggs so I miss the potential of 5 different lunch time meals

DH has always cooked from scratch and we grew up with fresh, seasonal foods. Then ultra processed crept in

. We use our local butcher as often as we need to and DH catches our fish. Tinned, frozen and packet veg are good standbys.
Perhaps if U kept a 24 hours food/drink intake diary for 3-5 days to see if there is anything that you could out/back on. Alcohol for example is known to layer weight on as we age. All fruits are good for us despite them having 'sugars' which the body deals with differently to those in cakes etc.. Don't ask me to explain it, it's all about converting into fructose, lactose or something similar - I didn't do biology in school

Batch cooking for the freezer to take out that morning so that you don't pick as you are preparing your evening meal? Treats are essential

Is your BP caused by your weight and how often to you take a reading: best of 3 B4 breakfast is how DH checked his.