We can't see any tris, but if you're talking about reducing the amount of quads from 6 to 2 you can do it this way:

First select this edge and push it:

Join the opposite vertices:

Dissolve the vertical edges:

Then push these edges:

And again join and dissolve:

We can't see any tris, but if you're talking about reducing the amount of quads from 6 to 2 you can do it this way:

First select this edge and push it:

Join the opposite vertices:

Dissolve the vertical edges:

Then push these edges:

And again join and dissolve:

You can even end up with 1 quad if your topology allows you (you need to dissolve an horizontal edge on the left or on the right):