I haven't done a WTRL TTT so it would be good to understand how it works and what the best tactics are:
Well firstly use a road bike not a TT bike because we all need to draft! (Actually don't think it will allow TT bikes anyway but wouldn't want to test it!)
Stay together as a group for as long as possible, taking turns pulling hard on the front. How you take turns can vary and I've been in a few different teams with different tactics for this. Some try and be very organised and number each rider 1-6 with designated rota for 30 second pulls. Others just ride as a blob with natural churning on the front. The really organised thing rarely works for very long to be honest so it usually ends up being a mix of the two.
Using Discord is really important - it can be helpful to tell people you are coming through to take a turn on the front because otherwise you often get two or more people trying to get to the front at the same time, and people are therefore wasting energy.
Time is taken from 4th person over the line, so while it's good to stay as a full group for as long as possible (more draft/speed), you can also let a couple of riders drop off the back towards the end if needed - sometimes if you know you can't go much longer it's worth saying, and doing one last suicidal hard turn on the front before dropping back.
If you do it right, it will be REALLY hard - I get some of my my highest w/kg figures from team TTTs