Try to on and off again for longer periods, say 30 min.

Try with cable connection.

If still slow, call 100 to complain

Maybe TM need to change your equipment

It's always a chicken and egg issue.

TM always say need sufficient demand before they will roll out Unifi to certain areas but people will only want to subscribe when they see that TM has rolled out and the service is stable.

Another issue is with lack of competition, there is little urgency to roll out.

But to give credit where it is due, my experience with TM for Unifi has been good but there is still ample room for improvement.