Unlike e.g. vitamin C, excess vitamin D isn’t really excreted. It’s stored long term and eventually causes hypercalcemia and kidney stones if persistently supplemented at high doses over a long time. OP’s dosage is above the “sensible if you never see the sun” range but not quite in the “dangerously excessive” range.
Do you mean hardware encoding, because that's what's paywalled in Plex.
I personally migrated from a Jellyfin ecosystem to a Plex with Lifetime Pass one when building my current server - while both are highly capable media servers, Plex has, by far, the better clients.