Rewarding a player with exp, but scaling with their level

How should I scale exp gained from quests? For example I want to give a player 700 exp for completing the first quest, which should be quick and easy to do.

However, as the player progresses, and levels up to a high level like 50 I want the scale to be less and less each time so it takes longer to level up.

I’m having trouble coming up with a formula for this specific part of my leveling system.

A simpler approach would be to make it so it requires more exp to level up at higher levels.

divide the reward by the player’s level, try charting out curves with desmos where x is the player level.

playerxp += 700 / playerlevel

Jinx has a good point though and it’s easier for players to understand higher levels require more experience vs higher levels mean less experience. And how would you communicate “you get 700 experienc unless you’re level 20 then you get 35”