I have a PLLC here in Texas. I get about 3-4 calls/emails a day inquiring for services, and things are only ramping up based on the website analytics I am seeing. This all happened about 1.5 months ago after getting paneled with insurances. I am paneled with BCBS, United, Cigna, and soon-to-be Aetna, and I also have a private pay option. I make use of a variety of print and digital marketing strategies (i.e., flyer, brochures, business cards). I literally will "cold call" (email) various healthcare providers around my area, my state, and around other states that are part of PSYPACT. I belong to like 8 Facebook groups (one is a PSYPACT psychologist group) where I routinely post and advertise my practice, and also look at others' advertisements to "put my hat in" for consideration for a referral. I have Google Ads, a Psychology Today profile, I make short videos on various topics that I post to my practice's Facebook, Instagram, Twitter, LinkedIn, and Youtube pages. I make sure my website's SEO is on par to come up in organic listings, I also have a Google Business profile that lists my practice on Google based on its address, so effectively, my practice is coming up in the top 3 sections of Google searches (i.e., the top is for paid ads, the second portion is for address-based business, and the third portion are for organic results). I have been invited to some networking dinners at some nice steakhouses where I pass around my print marketing materials.
Oh, I also do corporate sponsorships for small-time local events (golf tournaments) so that my logo and website are marketed when I donate and sponsor. I also belong to variety of state and national listservs that have my practice information that is routinely marketed there.
Alternatively, I am looking to start creating "on demand" CEU courses that can be passive income for me as long as I can get them accredited by either TPA or my local psychological association.