Old characters from frostmourne s1 transfer to Icecrown

Hello

i would like to ask you if character trasnfer from frostmourne s1 server to icecrown is still possible at this point, because i was inactive for sometime but wouldnt want to lose my characters since the new season of frostmourne server started. Thank you for your response.

Not anymore, no. It was possible for an year (the whole duration of S2), but with the release of S3 that stopped being available.