Possible Clues:

• At the limit, with 'out'
• ___ out (at the limit)
• -- out (used to the limit)
• Reached the limit, with ''out''
• Hit the limit, with 'out'
• At the limit, with ''out''
• Like a credit card at its limit, with "out"
• Reached a peak, with 'out'
• Plateaued, with "out"
• Used up, with 'out'