For your issue with review solicitation, you’re right, it could be a bit of a task acquiring a renewed customer list from your clients frequently. However, there are some CRM (Customer Relationship Management) tools out there that can automate this process for you. for example, tools like HubSpot, Salesforce and Zoho could integrate with your service to directly pull new customer data, whilst keeping privacy and data security in consideration.
In terms of other services, alongside SEO as you mentioned, consider things like content creation and marketing, social media advertisement, and email marketing. they are all highly effective and sought-after services. local service based companies would also benefit greatly from local SEO and geo-targeting services. don’t limit yourself to just PPC – digital marketing is a vast field with lots to offer.
Also, training and consultancy would be a great aspect to look into. Many SMEs look for basic to advance level training/consultancy related to digital marketing. seems like a lot, huh? but these services can strategically align with PPC and can make your portfolio more appealing to potential clients.
hope this helps! and good luck with your business endeavours. Let me know if you have further queries, happy to assist further.