I want longer hair no split ends hair tips please and thank you!?

I have alot of hair. Its volumous and thick like most hispanics. Its a little wavy but on the straighter side. I want to have it long though! I miss how long it was before! I used to have really long till the girls at school told me i needed a change and i should get it layered and shorter. I loved my hair but the pressure got me in 10th grade and i cut it! It turns out they were jealous of my hair cuz guys wud compliment it alot they even tried to make me dye it but i didnt listen. 3 years later i havent been able to grow it back. I get split ends and i have to cut 1 to 2 inches off so it doesnt get a chance to grow. Never dyed it a probably run my straightener 2x a week but only for about 5 to ten mins. No hair products. Only shampoo and conditioner every other day. What can i do to make it grow? No more split ends!? Thanks for any hair tips. Its not even oily or too dry.Sorry if i sound conceited bout my hair but im pregnant and its the only thing that makes me feel good at 35 weeks pregnant now.