But they are missing the beauty of the opportunity. The client that already gives you work is very very likely to give you another job. She is the lowest hanging fruit. So everything you do when you are working on her job should be working towards securing her future business.
Yes of course your immediate task is to do an awesome piece of work for her. But your larger task can be considered as “turning this job into the next one and the next one”. You don’t have to hard sell. Just show her you are excited about her job, ask her about her hopes and dreams for her career, tell her about other interesting stuff you are excited about – all this is selling and you have a captive receptive audience
And there can often be an even bigger opportunity than that. In the case of one client – a film director who was shooting a commercial – he told me that everyone who worked at the ad agency had showed up on the shoot. All 15 of them. Better and better I said. Every one of them can become a client in the future. They will all probably move on to new agencies. What a magnificent sales opportunity – don’t miss it.