A list of simple things to be done: the idea is that each might take an evening or afternoon.
Add a decoder to the class 33 loco.
Look at the front bogie of the class 159, non driven end: it doesn't seem to detect on the "stop" sensor.
Make High Street buildings at at Petersfield.
Ramp speeds into Clanfield.
Track cleaning train schedule. or schedule sequence.
Add roadway near Petersfield.
Add trees on backscene on road to Portsmouth.
Add scatter & lichen on road to Portsmouth and road behind Eastleigh.
Glue back the backscene behind Clanfield.
Add some weight to the BR red carriages, and test through junctions.
Add some weight to the oil tankers. If they derail, it is usually on the point under Eastleigh to the passing track.
Run a power wire for the MQTT gateway.
Consider adding one more storage track from the turntable. Would need a block detector.