Looking for guidance in acquiring another microsaas company

I acquired a micro-saas company that had very little revenue (<$500 MRR) a couple of years ago that has done really well and since acquisition I've grown it ~20x just working on it part-time. It is continuing to grow and I expect it to reach 500k-1M ARR in 2-3 years.

I also recently spoke with another related micro-saas company that would be a great acquisition for us and help accelerate growth even further while giving me the necessary scale to hire full-time employees (right now I have a part-time developer and I invest a part of my time) and for me to do this full-time. This company has about 500k ARR and is in an adjacent market that I've been interested in expanding into and with the combined capabilities can really accelerate growth.

I know this is not a typical searchfunder model, but was hoping to get some insights from the folks here who have acquired or funded SaaS companies in the past. If I go through the acquisition path will also need to figure out funding as there is no collateral to take a loan on.