Intentionally, Lemmy itself doesn’t total your upvotes and downvotes. You can go to your profile and see them for a given comment or post, but not an overall total. Some apps do show it.
Most of us agree that Reddit karma caused people to post and say things just for the karma, which was an overall negative. People put too much value in the score. So while we have upvotes and downvotes, they’re deemphasized, and that’s on purpose.
I’m not sure there’s less incentive to post generally, but there’s less incentive to repost old stuff, misleading headlines, etc.