After reaching 2k rep , I'm not receiving +2 rep per edit. Why?
The other way to gain reputation is by suggesting edits to existing posts as a new registered user. Each edit will be peer reviewed, and if it is accepted, you will earn +2 reputation. You can only earn a maximum of +1000 total reputation through suggested edits, however.
Given you hit 2000, you lost the ability to suggest an edit, so that no longer applies, because you earned this one
2000 Edit* other people’s posts, vote to approve or reject suggested edits
* Without suggesting. Yes you read right, you can now edit away at will without awaiting approval.
This seems fine to me. By the time you've got that level of reputation, you're already engaged with the site, and probably making corrections as needed. If editing is really your thing, you can go for the editor badges.
(And you still do get +2 for accepted tag wiki edits.)