It’s the same advice as has been posted here in this thread earlier and elsewhere many times, wasting petrol doing long journeys in 3rd gear to cure something that will only come back again.
The car is simply not suited to shorter journeys. Buggering about wasting time and money (petrol) reving the engine up in 3rd won’t cure the fact it’s a bad design.
Please excuse spelling/typos. Apart from being a clot it turns out I had one on my cerebellum that's now causing various problems!