You are in the "not-enough-AI" stage - keep increasing your usage but try to keep it very gradual to avoid entering the "do-more-AI-within-this-budget" stage too soon. It seems like the firing would be in following stages:

1. too old/expensive

2. not using AI

3. using AI but not productive

4. productive using AI but not within AI budget

5. reduce AI budget and GOTO 3