The key is compost. Add back worm castings (or another form of compost) and a slow release fertilizer to go for another round. The microbes that are active in compost is what keeps ph in range. Adding lots of organic material usually drops ph slightly which is why you also want to add a mineral input as a buffer like dolomite lime and/or crushed oyster shell to bump it back up. Add everything at once and allow 30 days to normalize ph; aka “cooking” the soil. The idea is to add all that is needed in the container and then all you need to do is just add water.