Question for freelancers/agencies – What is your lead conversion rate?

Hello,
I have a question for those of you who own software dev agencies, what is your conversion rate? In other words, what % of leads become your paying clients?
I'm a freelance Google ads expert that manages lead generation ads for software development agencies and they have been getting clients at a conversion rate of about 4% (our cost per lead is less than $10).
Considering this is a high ticket service ($10k+ usually) is 4% ok or too low?