As Hena says, you have exceeded the allocation for Titans.
Either shift to a reaver titan/warhound titans, or ask for the battle to be 2700 points.
First off, what flexibility do you have with what units you can pick?
Second, are you using aircraft? The Codex marine list is balanced for air operations/support. Without it you aren't playing to their strengths. likewise will your opponent take any aircraft? if so you have no AA units to shoot them - either ground flak or your own fighters.
Hena has the main points - a chaplain with the terminators is far better for how hard they hit - 50 points less yet a +1 to fighting resolution.
Assault marines are designed to be air inserted, using them in a ground role is difficult, can you get a thunderhawk for them?
Supreme Commanders do well in tactical formations. As Hena says it is better to get 1/3/5 razorbacks because you get a rhino with an empty transport slot, useful for keeping the formation mobile. (So get 1 razor and 3 rhinos, or 3 razorsa nd 2 rhinos, etc.)
You could consider switching the assault marines for some scouts (with a razorback) who can act to mess up the enemy plans.
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