I have been a believer in apocatastasis, along with Origen and Hans von Urs Balthasar, for a very long time. I have never been convinced that the Greek word αιωνιον means "eternal".
If that is the case then you need to accept Jesus as your Lord and Savior.
Mat 25:46 And these shall go away into everlasting punishment: but the righteous into life eternal.
I also gave you in the WORD the Greek expression for age unending, used that way only by John writing Revelation. Eis Aion Aion.
Since you don't believe Anionios means Eternal then you don't believe in Eternal life with Jesus, so take my advice and give your life to the Lord today. In Jesus we have Anionios life (Eternal) Also.
Anionios is a Greek Adjective............ It stands on it's own or defined in the Article. On it's own it continues without stopping, unless defined. You should do a bit more research. All Greek Adjectives are like this and why the Holy Spirit used it for Eternal life with Jesus.
Phm 1:15 For perhaps he therefore departed for a season, that thou shouldest receive him for ever (aionios);
Here they were instructed to receive Onesimus For as long as they could, or possibly the end of Season. In this case Aionios is told how long to wait.
Keep painting the building aionious until I return........... (Here you paint until I get back)
Anionios has no beginning or end. It just continues and used in the Greek article to be defined. Unless defined it's perpetual. It's root is Aion which has a start and end age, or a defined period of time, most likely from
aei which should continue forever but the process repeated over.
Blessings.