Can’t keep enough charcoal. Need solution. How do I maintain enough charcoal?

Disconnect all buildings that do not need to be connected to the main castle. Disconnect the roads. Only connect your worker huts, production buildings, storages, troop training (whichever you want to produce), blacksmith, dragon altar. That's it. Disconnect all the other buildings (Including Tavern) by cutting off the roads leading to those buildings. If you need to upgrade one of those buildings, just connect with a road, start upgrade, then disconnect.

By doping this, you will effectively reduce the charcoal consumption by at least 50%. I have seen some people disconnect Farms and Ale houses also to further reduce charcoal consumption.

One thing to keep in mind - The higher level a building, the higher the charcoal consumption. So, if you do not really need a building in high level, do not upgrade it. Make sure to keep the Tavern disconnected at all times because this is the worst charcoal consumer. Definitely max the Charcoal Workshop. That will increase charcoal production. Definitely upgrade charcoal factories, which will improve charcoal production rate and efficiency. Dragonite workshops and Crystal workshops do not consume charcoal. So, no need to disconnected those.

Goodluck

This will depend on your level. But in general you need to make sure to upgrade the charcoal Workshop building to the highest level you can (same as your castle level) ans then also build and upgrade all the charcoal factory buildings you can. These need to be supplied with lumber.

Upgrading the factories will make them more efficient and let them run for longer. So if you can upgrade them further you will get a better rate of production out of them. If they are upgraded and you keep them stocked with lumber then you will have enough charcoal being produced.

You can also buy charcoal often in the trading house / float and its worth doing this to have backup supplies to use when you need them.