There are different strategies. Specifically on your subject, that is "Cleaning Services", it is logical to assume that the focus is put on Local SEO - with information on the topic is no problem. For example, in Russian
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Part of the links - a mini-exchange, but they are not public and with its cons, because most often it is just a link (like a Manager/copywriter-entrepreneur) between sites and you. It is possible to search for the platform and agree on the placement there, but it takes a hell of a long time. Plus, the top theme sites are almost impossible to get expertim content (difficult even with expert).
Hire freelancers - as an option, a lot depends on your abilities Manager. To automate the same work as in the case of exchanges - SAP, GGL, with Mirka, etc. is unlikely to succeed.