If you would like to change the price of any service, you can do so.
On your dashboard > Services tab > click the three dots in the top right corner of a service. There you will see a Pricing option. This will show you the worker fee and workify fee, plus your profits of the adjusted price.
Workify's cut won't change, you will keep all of the additional profit for any service you change the price of (minus any additional Stripe fee for the markup).