RUTC40 self promote 3G to LTE

We have deployed a RUTC40 with a single ESIM.

The nature of the cellular network is that it is enabled and disabled at certain times. Upon enabling of the cellular network, 3G is activated first and 2 minutes later LTE is switched on.

The RUTC40 is set to “auto” from a network selection so correctly connects to the 3G network.

We require the RUTC40 to “self promote” to LTE once the network becomes available, what is the best way to achieve this as I understand the router is behaving as expected presently - connecting to a Network and then not scanning for. abetter network as the 3G is stable?