I'm not sure if you've done much of an investigation into these but:

1. Parcel deliveries - unless you work for the main carrier e.g. Royal Mail in the UK I don't think you can expect to make more than minimum wage and will effectively be on a zero hours contract with no benefits. I don't think this is going to be better that software.

2. Train driver (or bus driver, lorry driver), this might be ok and once you are in does pay well in the UK (but probably half what you get paid as a developer). It's definitely going to be a candidate for automation in the next 5-10 years though.

3. Electrician / plumber - you could add to this painter, builder, plasterer etc . This is decent if you have the skills, work hard and are physically up to doing it for an extended number of years. You'll likely have to manage your own work load though. May pay the same as software if you really work on it.

4. Mechanic - I don't think the pay will be amazing, what you say about cars not being repairable really isn't true especially for none EV. You still have brakes, oil change, servicing, tyre changes and alignments and lots of other things that people pay for throughout the lifespan of the car. Garages near me are always busy (as are cycle repair shops).