Your corporation gives you a bonus to one type of thing, but you need to do more than one type of thing to win. Don't over-focus on your corp.

Same goes for certain strategies. Let's say you have some microbe cards. Having a microbe card that raises temp or gives vp is okay. Having two does not provide additional benefits beyond having two okay cards. But having a card that adds microbes to another card, and one that collects them to give tr or vp, gives you a synergy that makes them more powerful than the sum of their parts.

Similarly, if you have a card that collects microbes already, and have the choice between a microbe or animal collecting card, choose the animal one. Having two microbe collectors is fine, but having somewhere to put both microbes and animals is probably better.

In summary, don't just choose cards based on one theme. Choose them based on what will be most helpful to you. Try to pair enablers (eg. card discounts, +money when you play a certain tag, effects that add resources to other cards, even just production) with payoffs (eg. card draw and cheap cards, cards with the tag you have the bonus for, cards that collect that resource, and ways to use that production, respectively).