Hello @Sandy35 and welcome to our o2 community :-)
In a situation like this working from home has become the new normal, a fast and reliable internet connection is of high importance.
If using an internet connecton via a mobile network there are many factors that influence the attainable speed and stability of the connection. If you have the possibility to place the LTE router closer to a window or in a windo that is facing the LTE antenna you may recieve a higher speed.
Since a mobile network is a shared medium it is still possible that even under perfect circumstances the maxmum speed will not be reached in all cases.
Regards,
Lars