Hair is breaking

My hair is breaking off and falling out excessively. I cut it pretty short around this time last year like just over my shoulders, and it’s grown maybe 2 inches since then (it’s just past my shoulders now).

I’m getting married in 6 months and I really don’t want to chop it all off again.

Help me... what can I do to make it grow other than cutting off a bunch?

I don’t use a bunch of products or dye it too much, like once every 6 months to cover greys (professionally).

I’m already using moisture shampoo/conditioner and rinse using lukewarm water. I have no choice but to wash every day because my hair is disgustingly oily after 24 hours.

I also don’t use excessive heat either, I only blow dry it once it is damp and use a straightener maybe once a week.

Helllppp