I choose "WIPE and upgrade to Nomifactory modpack, the continuation of Omnifactory."
Why not upgrade to Nomifactory without wipe? I don't detect lags and maybe instead turn off chunkloading for players, who don't log in more than a week? I play on server two weeks and I don't really want to wipe. Or maybe there is a way to transfer player's inventory to upgraded server?
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I have other idea: server with modpack "TerraFirmaResque" based on GregTech 6 and TerraFirmaCraft. Because I searching for server with this modpack for years and I can't find it nowhere, despite the fact that the combination of mods is very interesting. However, I came here to play Omnifactory (Nomifactory) and would not want to lose this server. So maybe is it possible switch some other server to TerraFirmaResque?