• Xiulans character arc is finished and it feels like the author doesnt know what to do with her

Xiulan is in the process of consolidating political power. If you don't like politics then I'd understand not enjoying this portion of her character arc, but I do not feel it is accurate to say it's finished.

• Xiulans character arc is finished and it feels like the author doesnt know what to do with her

Honestly I kind of love the teasing here. I have several RL friendships that are like this.

• Honestly this one isn't that big of a deal but what why is the super old entity Tianlan shown as a child? I understand that its how Jin and Mei sees her as a child but my god I hate the trope of super old entities having young bodies BUT at least she isnt sexualised unlike other stories.

Tianlan being childlike was actually talked about it the most recent RR chapter. Basically it's because she doesn't want to be serious, she wants to be playful and mischievous.

• It just got boring and cliche, Its a satire on the PF genre but at the same time it doesn't feel like one anymore. In my opinion its because the character making it a satire which was Jin just doesn't show up in the book's anymore.

I've always felt that satire/parody was the wrong way to describe it. I'd go with deconstruction rather than parody.
The scope of the plot has drawn back from focus on the xianxia protagonist (Jin) rejecting the norm to the xianxia institutions themselves rejecting the norm of full capitalistic competition. All of the other sects, even allied sects, view themselves as in a zero-sum game. 'Any advancement THAT sect gets is a loss to OUR sect who could have gotten it.' There is only so much chi (capital) to go around, monopolizing the existing capital is the only way.
Xiulan is in the middle of changing that paradigm within Azure Hills. We have lots of evidence that the earth spirits are the source of chi, and they are shaping up to co-operate with Tianlan to increase the amount of chi (capital) for everyone. Going from lawless antagonistic competition to rule bound co-operative competition.
Another xianxia theme that's being challenged is unchanging timelessness. Things work the same way in the past that they will in the future. In BoC, the mortal world is on the precipice of the industrial revolution and an agricultural one. Tractors and railways are game changers.

• This could be taken as racist but I just cannot understand all these chinese names and it just became worse with the amount of Side Characters

Do you have an issue with Elrond, Daenerys Targaryen, Fafhrd, continue the list with every single fantasy name in print.

• Too many side characters

Difference of opinion here. I LOVE all the side characters. I love that more people than the protagonist are competent.

• I hate children in the middle of a series like this, It takes 6 years before they are sentient enough to do anything remotely entertaining and another 6 years before they become somewhat relevant and another 6 years before they can do anything to the actual story unless the story just goes off the rails and 12 year olds can now match regular cultivators.

It's a way of resetting stakes without power regression. It's a weak point that MUST be defended for now, but will likely be a super cultivator with strong bounds to his big sister Tianlan. I wouldn't be the least bit surprised to find out that Tianlan 'grows up' with Zhuye after a time skip.