I do not have any personal experience of strokes so you will have to verify any information that I give.
Serrapeptase, Nattokinase & possibly lumbrokinase supplements might be helpful but I do not know whether they could get past the blood/brain barrier so that you would need to check. Also be aware of any interactions with any medication you take. Nattokinase can cause a lowering of blood pressure.
Proline amino acid is also part of the expanded Pauling Therapy and you do not mention taking that. There are other things which are recommended which you do not seem to be taking. Limiting/lowering carbohydrates and simple sugars which compete with vitamin c might be helpful. Lowering Omega 6 intake and increasing Omega 3 fats/oils would also reduce inflammatory processes which could be helpful. You might have to be careful with these if you are taking blood thinning medication. Check on this before taking these.
Increasing your magnesium intake even more might be helpful as 750mg is not all that high. You could purchase some magnesium carbonate and mix with the vitamin c (ascorbic acid) which turns from white cloudy to a clear colour when the carbonate has reacted with the acid to form magnesium ascorbate. You can also add it to the lysine and proline as these are also somewhat acid. Warm water helps the reaction and a little stirring. A magnetic stirrer/hotplate would make it easier and quicker. Vitamin K is also recommended along with a few other things which are detailed in the enhanced Pauling Therapy.
Tri-Methyl-Glycine (TMG) can be helpful as it helps lower homocysteine levels. It is fairly high in Beetroot and can be purchased as a power which is white and called Tri-Methyl-Glycine. It is quite Yang in energy so only take it in smallish dosages such as 1ml scoops depending upon your nervous system and your tongue coating. If your tongue has a thicker white coating then you can take more of it but if your tongue has very little coating then you would have to keep dosages very small. The best thing to do is to take a small amount say 0.5ml and then after an hour or two compare your tongue coating to how it was before you took it as the coating will reduce making the tongue look redder. See how long it takes to take effect. It could be 1 to 2 hours, 90 mins. In very high doses it can be too stimulating. Beetroot is reasonably high in carbohydrates so does have that downside which the TMG powder does not.
Red, Black, Blue fruits, particularly berries are excellent for strengthening the circulatory system as the proanthocyanidins are incorporated into the walls of the circulatory system and they complement vitamin c. They also strength the skin and bones too. The problem with berries is that they are also high in sugars. There are extracts available such as Grape Seed Extract which are effective and do not provide sugar so are a good alternative to berries. GSE tastes pretty terrible. lol Putting it in capsules would get around this.
Curcumin/Turmeric has some brain protective properties which might be helpful if you include it regularly in your diet. Black pepper at the same time and fats can help it's absorption and delay it's breakdown. Black pepper is also a circulatory stimulant. However once again, both of these, Turmeric/Curcumin and black pepper could affect any medication you take. Black pepper in particular can delay the breakdown of medications in the body which could increase the effects of medication. It's a component of black pepper called piperine which is responsible for this effect and the levels are fairly low in black pepper, it can be purchased as an extract which would have a greater effect. PhosphatidylSerine is meant to have a similar effect as piperine in enhancing curcumin absorption but PS is meant to reduce cortisol levels which is not always a positive effect as cortisol serves important functions in the body which can affect nervous system function which might have negative effects as it can affect nervous system function towards the outside of the body, blood pressure (potentially lowering it) and the blood flow in the arteries. I personally do not see supplements such as PS as being beneficial.
Ginkgo biloba could be helpful as it does help circulation in the brain. Check carefully before taking it as it can interact with many medications!https://www.drugs.com/drug-interactions/ginkgo,ginkgo-biloba-index.html?filter=2&generic_only=
Taking a circulatory stimulant might be helpful to drive everything around your body. Cayenne pepper is very good at this.
Look into Manganese excess as that can cause heartbeat irregularity therefore it might be worth reading up on that. Manganese excess can affect Magnesium usage by the body. You still might be far too low in Magnesium. I do not know what kind of magnesium you are using, I hope it is not magnesium oxide. I would recommend a more usable form of magnesium or create your own using magnesium carbonate mixed with acids to create magnesium salts which are much better used by the body. Mixing amino ACIDS and Ascorbic ACID with magnesium carbonate gives rise to magnesium salts. Some forms of magnesium require working stomach acid levels and this could be compromised. Low stomach acid could of contributed to your problems so it might be worth investigating whether your stomach acid levels are sufficient. When that is compromised, many health problems begin.