You will probably never listen again Greek language to Eurovision because its clear now with english languege we do better and we always qualify. So english language is the solution.
If Slovenia can qualify with a very subtle song in Slovenian and introvert performance then I don't see why Greece couldn't make it to the finals with an entry in Greek? Problem is the juries have a quest against local sounding entries, regardless of language almost, but even more against the more authentic ones which is why you failed last year. I wouldn't say the language alone was the issue.
You will probably never listen again Greek language to Eurovision because its clear now with english languege we do better and we always qualify. So english language is the solution.