make it easier please: How to use code fences
edit your post above and place the content within fences (```)
You are swaping alot
I don’t think that you can do much with the rPi0… it has only 512MB of RAM 
Get a new rPi (3b+ is very good)… but even then… if you want to run OH2+InfluxDB+Grafana+other stuff: I would recommend something even bigger like a NUC.
Influx recommends a min of 2GB RAM: https://docs.influxdata.com/influxdb/v1.7/guides/hardware_sizing/