ᐅ How can I speed up the decomposition of my compost?

Hi,
it seems like we are doing something wrong with our compost. About three years ago, we had a lot of grass clippings and piled them all up. Now, when we wanted to spread it as soil, it turned out to be a slimy, tar-like mass with grass still visible inside. We also used a rapid composter, but it seems to me like a complete scam.
Is there any trick to help the green material decompose faster?

Pouring on chemicals

A pile of grass is not compost... This pile lacked air (oxygen) inside. Grass clippings can be added to compost, but alone they won’t work. Compost should be placed directly on the soil, the materials should be mixed, and it should not cool down too quickly or dry out.

Perfectionists turn the pile after a few weeks (this aerates the lower, already decomposed layers).

If you have a lot of grass clippings, you can use them as mulch under shrubs, hedges, and on garden beds, meaning spreading the fresh (!) clippings in a relatively thin layer (no more than 5-10 cm (2-4 inches)) on the soil.

Yes, the grass clippings are now mulched directly by our mower and no longer go on the compost.
So, it’s a lack of oxygen issue. We have now spread out this "sludge" – this way it gets plenty of air. Maybe this will solve the problem. 🙂

Mix with soil rich in organisms. Steal good soil from your own land or from the edge of the forest, containing plenty of earthworms, woodlice, springtails, beetles, mites, etc.

Then air. Then time.

Once this process is underway, apply layers once per year.

Layers?