Extend + Upgrade my DSL when moving

I am planing to move to a new apartment next month and will stay there for more than 3 years.

At my current place, I am already using DSL which expires in 5 months from now.

I am wondering if I should bring my current DSL contract with me and then make a new contract when the previous one expires.

At my new place, I will start to live with my partner and need to share the internet, so upgrading would also be necessary.

But if I do so, I will have to pay 50EUR just for transfer, so I don’t think of it a wise option.

According to  this page, the transfer fee vanishes if I extend my contract for another 24 months.

So, I am now wondering if it is possible to extend my DSL contract while moving (to save 50EUR) and then to upgrade my DSL contract to a better plan in the near future.

It would be nice if you have a better advice for this situation.

Thanks in advance for your help.