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Starting a campaign soon starting out with 750 points and with tau, eldar, and tyranids out and about what should i bring to stay relevant. Must take units and strong combos, lists that will keep me competitive.

A list of what you have might help

Off the top of my head i have; about 30-40 marines, 20 termies, 3 centurians, 10 assault marines, 5 vanguard vets, 5 assault termies, dreadnought, 2 TFC, a predator with lascannons, 2 landraiders, stormtalon,stormraven, 10 scouts 5 with snipers, around 18 sternguard, a rhino, 2 drop pods, and 6 bikes. Might have more but not that much more.

Okay so you will defiantly need 20 tac marines with p cannons and p guns

I would take some sternguard in the storm talon to help kill big stuff like riptides big nid bugs etc.
or maybe use the bike squad as a command squad and take all grav weapons and FNP

I would also take one thunder fire for there cost and effectiveness I think they should be an auto take for any marine army

Maybe consider a librarian or tigarus for army buffing because at this points limit an expensive HQ would be a waste

I’d stick with 5 snipers and a full tac squad for your troops at 750. Put the tacs in a pod, give them melta.

Fill your other pod with sternguard and your HQ. Might not be able to get the pod full at this point scale, but do what you can.

TFC and the talon would probably round out your list. Points permitting, you could take the raven over the talon. If you do, run it empty as a pure gunboat.

As above! Always take Nevelon advice concerning SM!
Probably Iron Hands tactics, seconded by UM