NO, I DO NOT recommend akiradecryptor. org. The site is Suspicious at VirusTotal and elsewhere, their service is not free and they’re probably related to the original miscreants.
Instead, I would submit a generic infected file (no personal info, maybe a system file) to Avast as a False negative and to VirusTotal to get the ball rolling on the new variant. There is a great deal of talk about Akira on Google which may be a source of information to you, but use caution.