Hi @Cristofer_Moya,
Sorry for the delayed response.
It looks like your data is QIIME 1 post-split-libraries output, which we can import and analyze, but as a question, do you still have the raw sequence data? If possible we should start with that.
Assuming you don't still have the raw data, you can follow this tutorial to do OTU picking (DADA2 isn't an option without the quality scores, and we haven't wired Deblur up to use post-split format just yet).