Search API limits

Dear Team, we are using the search companies API which seems to be working really well. I am aware there are some API usage limitations in place relating to the frequency and volume of search results. I did some across a thread (however cannot seem to find again !) that discussed the possibility of increasing the number of API calls.

Can someone get in touch or point me in the right direction on how to increase this limit on our use case ?

(p.s the bulk data solution does not give us the data we require)

Kind Thanks