Barantor
Explorer
First thing I did was run several adventures with just the Basic 5E rules (free ones you get on WotC site). This gave a very basic game that was easy for players to pick up. I ran it with my kids and then once with some adults.
I would expand that idea by taking away most of the archetypes and limiting classes to their 'base' or generic archetype. Druid would be circle of land, ranger hunter, paladin oath of faith, etc.
Go back to Greyhawk. Use only races and subraces that fit in that setting. It was the default and Forgotten Realms has added many since it's introduction.
Take out short rests. For abilities that require short rests to recharge, set a 3 or 2 a day limit instead and only allow long rests.
You could take away advantage and disadvantage if you wanted to have hard mode, but I haven't played with the numbers enough to tell how much that changes things.
I would expand that idea by taking away most of the archetypes and limiting classes to their 'base' or generic archetype. Druid would be circle of land, ranger hunter, paladin oath of faith, etc.
Go back to Greyhawk. Use only races and subraces that fit in that setting. It was the default and Forgotten Realms has added many since it's introduction.
Take out short rests. For abilities that require short rests to recharge, set a 3 or 2 a day limit instead and only allow long rests.
You could take away advantage and disadvantage if you wanted to have hard mode, but I haven't played with the numbers enough to tell how much that changes things.