Yes, I understand the importance of reaching critical mass in readership. I spent a long time learning the craft and producing the first novel. Now I'm 10,000 words into the sequel, but that should accelerate after the New Year as I won't have all my time tied up putting food on the table.
My goal is to make every book better than the last.
John D. MacDonald, author of the Travis Mcgee series and about 50 other books, had been trying to gain traction as a pulp fiction writer in the 1950s. He waited until he had the first three Travis McGee books ready before releasing the first, so that he could roll them out about six months apart in order to build a snowball effect. I think that was a great plan, but these novels were only about 200 pages. But for sure, new titles help keep momentum going. OTOH, if you force them and sacrifice quality, you risk disappointing your readers.