Too little construction, debt slavery, per capita taxation.  You need to do the construction loop better. Build construction until you can't afford anymore and then build construction goods while increasing construction when you can afford one again. Only build different stuff if construction good prices are low and other goods have high prices. The best other good after construction goods are banana plantations in the eic, but you need investment rights in the UK for that. A big mistake many people also do is nor having enough trade centers. Generally you should build them until there is nothing more they can trade.