Hey!, I don't believe this is possible to regain access back to but around 5 years ago I played this server with a bunch of my mates. I joined back today not realising I was still in his island (Username (Liam_Spicer)) and I left without realising I was still in it... Thanks in advance if this can be achieved. Island was with from what I can remember: Blacki6369 Dxnasty_
Hello. Our 1.8 survival mode skyblock (.net) still exists. It is called the classic server now. Type /classic to switch to there. If you played on the old economy (.org) server, sorry, but that closed. Type /servers in game to see all the places.
Now that Brock Power knows that the island he played on previously still exists, let's go about trying to help with regain access. Do you happen to still have contact with the user in question? If not, I am not convinced you will be able to get your island back, all I can think is that logs may be able to prove your membership, though this may not be enough without express permission from Liam_Spicer.
I agree with Manubidoo. I think the only way for you to rejoin his island is to contact the island owner himself and have him re-invite you. Best of luck, anyway!