Hi Sergio,
Please ask your question in the Microsoft Certification forum using link below. There are support moderators over there that will respond to your question in 1 business day and can assist with merging your certifications into one account:
https://trainingsupport.microsoft.com/en-us/newthread?threadtype=Questions&forum=mcp
In terms of merging Learn badges/trophies/reputation points, I don't know if that is possible.
Please click Accept Answer if above was helpful.
Thanks.
-TP