To anyone interested in reading Wu Xia/ Xiu Xian/ Xian Xia genre of books, I remembered some of the more famous ones. I think there are english translations of them, at least the quick google search told me so.

The Legend of the Condor Heroes 《射雕英雄传》
An absolute classic. Not a single Chinese will not know of this series. It was (still is) so popular there's like a thousand remakes of this series into movies and television drama.

The Heaven Sword and Dragon Saber 《倚天屠龙记》
Another oldie, which also has many versions of television drama. Same author as The Legend of the Condor Heroes. His name is Jin Yong (金庸), and he has written many hit series. Go check him out.

Zhu Xian 《诛仙》
One of the most famous web novels (and then published and even got its own television series) in this genre. Check it out here for a translation of it. Quality of translation not guaranteed since its fan-translated.

(BEWARE! lazy reviews below because I am a lazy person.)

Ao Shi Jiu Chong Tian 《傲世九重天》
Hella good.

Xian Ni《仙逆》
Mmm. I guess, Yes, Read it. (I havent read this, just basing off popular opinion)

Piao Miao Zhi Lu/ Piao Miao Zhi Lv《缥缈之旅》
The godfather of this genre who created this system from scratch. Almost every other book of Xiu Xian genre is based on or derived from the system used within this book. I don't know if there's a translation out there.

Fan Ren Xiu Xian Zhuan《凡人修仙传》
Hell yes. Read it!

Chang Sheng Jie《长生界》
Oh my god. You better read it or I will strangle you.

Wo Yu Feng Tian 《我欲封天》
It's popular. but I personally found it boring after reading 65% into the book. The main character just keeps getting powerups like Goku with no end in sight. But it feels really good when you read about him beating people up, so I guess I'll throw it here.

Jiu Ding Ji 《九鼎记》
READ. IT.

Xing Chen Bian《星辰变》
Author: 我吃西红柿, wrote Jiu Ding Ji as well. She's a great author.

Xiu Zhen Liao Tian Qun《修真聊天群》
I love it. Hilarious! Love it.

Dou Po Cang Qiong《斗破苍穹》
Its another popular series. Heard its good.

k, getting lazy too lazy to write more.

Now most of this genre of books can be found online as many authors always write write it as a web novel, then if it's popular enough, it'll get published. Kind of like Wattpad.
Heheh, check out these authors as well:
Tang Qi Gong Zi (唐七公子)— her books have more romance than action, but its still damn good.

Tang Jia San Shao (唐家三少)— his books have more action (less focused on romance). His books also have other Systems that are not really true to the Xiu Xian genre, but eh, its still magical fantasy.

Er Gen (耳根)- He likes power-ups. Alot. Wrote Wo Yu Feng Tian and Xian Ni. Personally I find his writing style a little bland but his works are still a fun read though.

Of course, this list is not exhaustive, but I picked the most popular books (cuz they are popular for a reason). Its a good place to start.

AFTER READING ONE BOOK AND YOU LIKE IT, CHECK OUT THE AUTHOR BECAUSE THEY PROABLY WROTE MORE GOOD ONES
My god, its getting so long. I think I need to stop, but there's a treasure trove out there waiting to be discovered by you, fellow readers! Xian Xia/ Xiu Xian genres typically have books with 2 to 4 volumesHAHAHAHA READ TILL YOU DROP DEAD