I want to work in such a way that clients come back to me for services, because my company really can offer many different options.

Well, I think that clients reapply for services when they are satisfied with the conditions. Maybe you should think about it?

Personally, it seems to me that there are more effective strategies that really help to keep the client. I think it makes sense to try something like this one https://processmix.com/cases/regular-cross-sell-offer-calculation/. By providing multiple services to customers at once, you can retain customers. Selling something else to a client you're already working with is much easier than looking for a new client.