Hypotension remedies
Hypotension = low blood pressure
I don't know what your diet is like, but ensure you have a balanced diet with adequate healthy nutrition.
Include adequate salt in the diet. Hypotension may be caused by not enough salt.
The herb Licorice (in America) also spelt Liquorice (in England) is beneficial for hypotension. It must be the herbal medicine, not the candy. It is ideal if you can get the 1:1 liquid extract of Licorice. I don't know where you live, or how readily available it is where you live. Most herbs can be taken as a herbal tea, but Licorice comes from a hard root, so you may get less benefit if try to extract it yourself.
Taking too much licorice may cause fluid retention or high blood pressure, so use it sensibly.
Avoid supplements containing potassium.
Fluoride poisoning may cause or be a contributing factor in low blood pressure. If you have consumed fluoridated water for many years, purchase a water distiller and start drinking distilled water. Another option is to drink rain water.