Raising a revolving fund to acquire businesses

How do I go about raising a “fund” to acquire businesses? I have access to undervalued, high cash flow businesses. Primarily online service agencies. We have propietary processes to make these businesses even more profitable. We have a VERY long track record (since###-###-#### doing acquisition, growth, etc. All this time, we’ve used our own money. I can acquire these on my own via LOCs or SBA but I am limited by persona guarantees, delays in SBA process, and limited funds. My deal sizes are smaller even though we have a sizeable/experience team to increase profits of new businesses. What would be the best way to raise a variable line of credit I can tap into for acquisitions when needed? Venture debt? All new to me. Would love some help here.