first off, the airlock bubbling means very little. it's a co2 vent and bubbles for all sorts of reasons, fermentation only being one of those. only a hydrometer racing can tell you what's uo with your beer.
second, what you're seeing is totally normal. in a healthy ferment, FG will be reached in several days and the bulk of activity will slow before this. without knowing your OG, yeast type and the current gravity, there's no saying what you should de. but i do really doubt you need to add more yeast at this point if you added enough fresh yeast 4 days ago.
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