Does anyone have a link to the light novel?

Not all volume have fan translation as there is official translation (vol 1 -vol 10): https://yenpress.com/9780316414203/that-time-i-got-reincarnated-as-a-slime-vol-1-light-novel/

Fan translation (vol 6 - vol 11):
https://www.novelupdates.com/series/tensei-shitara-slime-datta-ken-ln/

Fixed MTL translation (vol 12 - vol 17): https://drive.google.com/drive/folders/14LqRkU1ayeIYi8MaKInDVF5LdqwVqehC

I recommended to buy official translation as fan or fixed MTL translation usually have different preference in the characters name in translation so it might be confusing. Especially when this story have a lot of characters.

so there is no fan translation for vol 2- vol 5 ?

I think there is none for vol2 - vol5. Maybe because the official translation already catch up or the anime already cover it, At least for now, i could not find it.

I recommend going to your local kinokuniya (their international stores carry Japanese titles) and getting a copy in English. They're out till 10 volumes as of now. A worthwhile investment and some side stories included too!

Good idea. The easiest way is buy the official translation.

Thanks for answering ~