Scrolls and potions should be limited, imo. Vendors shouldn't replenish every long rest/level up, imo.
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A lot of you might disagree with this, but I think the following would be incredibly beneficial to honour mode:
Remove all rare, very rare, and legendary items from the game. Let the villains use them, if necessary, but do not let the players get access to them.
That would be a phenomenal change. It would force players to use some of the incredibly interesting--albeit less powerful--items. Suddenly, all new builds would become viable.
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I also think many of the feats should be reworked. One day I'd like to make a post about that with some suggestions.