Make whatever you can. Piles, tumblers, bokashi, etc. Many moons ago I even processed within plastic bags to make leaf mould.
I have a deal with a local coffee shop. I pick up 2-3 times a week and average 4-5 gallons of spent coffee waste a day. Black soldier fly larvae and worms both seem to respond exceptionally well to coffee.
A small bakery nearby nets me the eggshells from 15-20 cases of 15 dozen eggs e per week.
I grab the equivalent of 300-500 large paper leaf bags each fall.
Kitchen waste is also used. Two households use my compost pulled ( including ours).
I also grab a few carloads of spent grain from a local brew pub. Depending on temperature, you only have a day or two to cover doesn't grain. It gets smelly otherwise.
I also get the spent tea leaves, hibiscus, lavender, and SCOBY from a local kombucha manufacturer.
That's mainly it. But I also have my ear to the ground for other possible sources to make black gold and feed my breakdown critters. If love to find an organic salad fixin' company close to my house!
BTW, I called an organic smoothie place a few years back. I assumed they did what I do when making a smoothie... Grinding up a lot of fruits and vegetables. I was told it was all sweetener and powder.
Anyway, I have a number of large compost piles, a tumbler, I sheet compost like a mulch in active vegetable beds, and I trench compost in all unused beds for the winter. I have a composting tower wherein I mix new poplar shavings and fresh coffee grounds and use oyster mushroom spawn to create mushroom compost.
I grow several banana trees. Every late October or early November they get cut and become part of the composting efforts. The worms REALLY seem to love banana plant matter. Not exactly sure what the draw is. But if they're happy, the compost is rich in worm castings!
I buy coconut coir, green sand, kelp powder, & crushed limestone to supplement as well.
When I end up with too much eggshell and coffee, it all goes under hedging and anywhere else I can sock it away to let it process.
I would kill for a local biochar option. We can't burn anything here like in other counties so I can't even make it.
Anyway, the short, medium, and long term rewards make it all worth the effort. I know people making compost in small bins on balconies in the middle of the city. They use it in their houseplants. Don't have room to do a lot? Just do a little... Or whatever you can.