Help! Generally feeling rubbish….

Hi all. I’m a 45 male, often feeling tired and lethargic. My bloods are good apart from high cholesterol. I’ve started exercising again and plan to lose weight. Improving my diet. But I’m looking for some sort of vitamin / supplement advice. Can people recommend something which has a good reputation for general health which has worked for them? There are hundreds of brands out there all claiming great things. I’ve used Bioniq previously and another high end vitamin but not been blown away. Thanks for your help.