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Reducing compost time comes down to heat, and proper bacteria count. Although there is some overlap with the bacteria and fungi between the two... There are many in the septic solution that will not thrive or even survive in condition for soil, or compost.

It is best to use microbes that are meant for the garden to avoid waste. There are many on the market, and they are inexpensive. Many hydroponic stores will give free samples away as well.

This article will help you to compost properly: https://www.gardeningknowhow.com/composting/basics/ultimate-beginners-guide-composting.htm

Without more and varied components it will be hard to produce real compost. The fir buds and grass clippings mixed and piled will break down in time, but if I were you I would use them as mulch.

Every garden soil is different. A soil test and Rx for mineral and biological amendments is the only way to avoid guess work and address actual deficiencies found in the laboratory analysis.

Mulch the soil surface with 2 or 3 inches of compost.

https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm

We don't sell any gardening products but it should be easy to find one on the Internet.

It sounds like this is some oil remains of potting soil; they may be fertilizer pellets that was in the potting mix.

Here are some tips on revamping your compost:
http://elgs.org.uk/gn-old-compost.html