2015 1.6TDI Reliability - Worth Investing?

So I have a 2015 Skoda Octavia with a 1.6TDI (Manual 5-speed).

It's just hit 80k miles and I am thinking of replacing the timing belt / water pump. My question is, is this car reliable and worth investing in? I want to keep the car at least 20-30k more miles.

Instead of investing in it should I consider selling to replace with a 2.0TDI Manual? Are there common issues that will occur from now as the car is getting higher mileage? I've heard about problems with injectors and EGR valves?

I only use the car for journeys that are 60 minutes plus, literally 0 short journeys. No issues so far except I had to replace 2 glowplugs.