Can I defer levelling up after reaching xp treshold?


As a rogue, I’ve gained enough XP to level up to level 3. However, I’m not yet ready to pick what archetype would fit best for me.

Despite having gained enough XP, can I wait until later to level up my character?

I’m looking for rules to back me up, especially if it explicitly states that I don’t need to level up immediately upon acquiring the xp treshold.