How can I read out loud japanese better ?

Hi,

So I learned hiragana and katakana 8 years ago. I did not forget them at all, but I would say I never trained myself to read a full paper in japanese. So now I can't read out loud with fluidity, my mind blocks it every 2 or 3 words.

Also one of my bad habits is that my brain preshots the end of sentences and I say something else for the end part, it probably comes from the fact I'm fluent only in talking japanese (hafu struggle lol)

Tbh, when I read in my head it's just slightly better because i dont have to read every single character with a voice in head.

How can I fix that?
Did you experience that?
Any ressources?

Has it every happened to yall?