Others have made excellent comments here. I want to add this:
- Mention that unless it's for a certain price range, you're no longer in the market. However, you will keep them in touch when you're changing the policy again.
- If the pricing/arrangement doesn't work for both parties, say you're happy to refer them to someone else who could use those projects.
Also, stay in touch with them regularly, but you don't need to go overboard on this, as you want to focus on your company.
- Mention that unless it's for a certain price range, you're no longer in the market. However, you will keep them in touch when you're changing the policy again.
- If the pricing/arrangement doesn't work for both parties, say you're happy to refer them to someone else who could use those projects.
Also, stay in touch with them regularly, but you don't need to go overboard on this, as you want to focus on your company.