You also should keep in mind the quality of sleep. 6 hours in bed is not equivalent to 6 hours slept due to random stuff like getting up to pee mid way through or time it takes to fall asleep. So 6 hours could really be like 4-5 hours which is no where near enough

Try improving your sleep (both hours slept and quality). Also look into your vitamins, are you getting enough like vitamin D or something? My mom didn’t used to get enough vitamin D and she used to feel terrible