The “Best Reward” is Jannah, and “even more” is looking upon the Face of Allah, as that was explained by the Messenger of Allah (PEACE BE UPON HIM), as was narrated :
“When the people of Paradise enter Paradise, Allah will say,
‘Do you want anything more?’
They will say, ‘Have You not brightened our faces, admitted us to Paradise and saved us from Hell?’
Then the veil will be lifted and they will not have seen anything more dear to them than looking upon their Lord, may He be glorified and exalted.
This is what is meant by ‘even more.’”
Then he recited the verse (interpretation of the meaning): “For those who have done good is the best reward and even more (i.e. having the honor of glancing at the Countenance of Allah)” [Yoonus 10:26]
So once you know that the people of Paradise will not be given anything there that is more dear to them than looking upon the Face of their Lord, it will become clear to you just how great is the deprivation and loss that awaits the sinners whom Allah warns with the words (interpretation of the meaning): “Nay! Surely, they (evil doers) will be veiled from seeing their Lord that Day”
May #Allah to keep us safe and sound & bestow upon us the joy of looking upon His Holy Face… Ameen!!!