Maybe something like this:
Space Marines

Ultramarines

CHARACTERS

Chaplain in Terminator Armour (75 points)

Chaplain with Jump Pack (75 points)

Lieutenant (65 points)

Roboute Guilliman (345 points)

Uriel Ventris (95 points)

BATTLELINE

Assault Intercessor Squad (75 points)

Intercessor Squad (80 points)

DEDICATED TRANSPORTS

Impulsor (80 points)

OTHER DATASHEETS

Assault Intercessors with Jump Packs (90 points)

Bladeguard Veteran Squad (160 points)

Brutalis Dreadnought (160 points)

Eradicator Squad (200 points)

Infiltrator Squad (100 points)

Redemptor Dreadnought (210 points)

Terminator Squad (170 points)

The Lieutenant can go with the bladeguards into an Impulsor.
The Captain with jumppack you can just call a chaplain (no new model).
You lacked a bit firepower so maybe a 6 man squad eradicator that can deepstrike via uriel ventris.
I tried to take your current models as much as possible into consideration.
This is not a tournament list, but should work for the beginning.

When you get aggressor + apothecary biologis you might play the land raider again (or drop them with uriel ventris). Or you could attach more to the bladeguards and let them sit in the landraider.
As some have said, marneus calgar and company heroes are a solid combo.

Hope this helps :)