If your photos look dull to you, I would suggest that the issue has much more to do with composition than anything technical (#3 does look back-focused, however). You need to get closer to your wildlife subjects, for example. Your vantage point for the baseball shots is slightly elevated as well, which makes for uncomfortable compositions.
Also keep in mind that many of the photos you see on this forum were shot with fast telephotos that obliterate backgrounds, making the subject really pop.

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