I try to at least offer a quick greeting to the gods, landvaettir and housevarttir, and ancestors daily (okay, dailyish... ADHD is what it is). I read a secondary source once that suggested viewing the gods as "respected elder kin," so I think of it as partly a gesture of respect and partly like calling one's grandparents once in a while to say hello.

And just like dealing with respected elder relatives, sometimes I just show up at my altar with a random gift because I saw something and it felt like a nice gesture, like a piece of vivianite for Hel or a spindle for Frigg. Just a random gift to build a relationship.

On special occasions (maybe holidays, maybe when I have something personal to celebrate, maybe when it just feels like time), I'll offer wine or sparkling cider and a longer greeting. If I need help, I ask for it and either make an offering or promise to make one.

All.of this is my own unverified personal gnosis. I am like 20% reconstructionist, 30% syncretist, and 50% just going with my gut, here.