Don't bother too much about what is called reputation on SE sites (as in this comment below your question). Instead, I'd rather use an approach like so to decide about the SE sites you want to be participating in, to start answering questions (or post your own questions):
- Create a list of some SE sites that are about topics that you're interested in, say about 5 to 10 sites.
- Start lurking a bit to see the kind of questions / answers coming up. Eliminate those SE sites from your list for which you discover the questions being asked are not that interesting to you. Try to reduce your list to say about 3 to 5 SE sites (your shortlist).
- For each of your SE sites on your shortlist, do some research by investigating some (up to 10 or so?) of its tags, to get an idea about:
- the kind of questions being asked (related to the tags you selected).
- the "top users" for each of those tags.
- the "unanswered" questions for each of those tags.
- Pick a few tags (from those you investigated), and start answering questions (unanswered or even those which already have an accepted answer).
- Give it some time to see how those answers are perceived, especially related to:
- the kind of comments they get.
- their votes and/or the accepts.
- the badges you earn from them.
- At any time, you can always adapt the above approach, either by adapting your shortlist of SE sites, and/or the list of tags you have decided about.
If you want to see a real world illustration of the above (=the results I got over the past few years using the above approach), then go checkout these links (all from on Drupal.SE):
And even though I think my location in the overall (what SE calls) Reputation ranking is not that bad, for me the best illustration of somebody's real reputation is reflected in the tags they appear to be involved in, and/or the badges they earned.