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For tips on how to learn/improve at Elixir take a look at our Learning Questions & Discussions > Resources Chat/Questions section as there are quite a few threads where people suggest various paths
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For certification, @ErlangSolutions has been around for almost as long as Erlang itself, so in the BEAM world there’s probably nothing that comes close in terms of certification credibility
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For career advice, again there are quite a few threads where people offer tips so its worth browsing the forum, here’s some of what I’ve previously posted myself:
Ultimately, if a company is not looking for a very highly sought after skill-set or individual (in other words where it is incredibly hard to find someone with those skills) then aside from the usual ascertaining of how competent you might be as a developer they’ll be looking at things like how you might fit in with their team, their culture, whether you share the same work ethic etc.
Remember, people generally hire people - if you want to get hired, ask yourself what would make you an attractive proposition, with that in mind you can’t go far wrong imo 
