Moisturizing products for hair

My hairdresser said that I need to moisturize/hydrate my hair. I have long blonde hair which I have been bleching for 5-6years. My hair is frizzy, easily tangled and I would say quite thin (not too thin but not thick either) 💇🏼‍♀️

What kind of products so you recommend? Mask, oil, shampoo, leave-in palsam?

In the past I’ve used Olapex nr 3 but I didn’t see any results from that. In everyday haircare I use Schwarzkopf’s white shampoo, Inebrya Ice Cream Dry-T conditioner, same brand’s keratin mask (once a week). After washing I also use Schwarzkopf’s leave-in conditioners (I’ve tried different - pink, black, purple, light pink ect.) Usually once a week I also apply homemade rosemary hair oil for several hours.

I thought I was already doing enough or even too much but hearing my hairdresser say that made me wonder, maybe I’m using wrong products. Sadly in that time I didn’t ask my hairdresser for advice.

Please nothing too expensive and thank you in advance 🩷