AltInventory allows you to magnify its item slots x2 and x4. It is currently the only bag plugin that supports this (I know that someone is working on an update for one of the others but no idea when or if it will be published).
https://www.lotrointerface.com/downl...nfo.php?id=414
It also supports viewing inventory on alts, etc.
The quest log is a bit odd. You can change the font size of the quest detail, but not the quest list or the header info. The control for the quest detail font size is in the bottom left of the quest log by default. If you are using a Skin it might have hidden the font control.