Hair Growth Remedies

I’m worried about my hair. It’s falling out. My hair is a bit layered and the longest is down to my waist now. Should I have it cut much shorter to promote hair growth? What’s the best hot oil formula can I use regularly at home? Is it good to apply warm virgin coconut oil on my scalp or olive oil

I have had the same length hair for five years now and I think it has stopped growing. I get a split end trim every couple of months but it just won’t go past the length it is now which is past my shoulders but not long enough. What are some vitamins I can take to stimulate hair growth and what are some things I might need to stay away from. Thanks!