Good afternoon bunch

.
Been an incredibly long time since I traveled the Pixalo road.
I had to put aside my camera and just about everything else some months ago, when both my parents got sick almost at the same time. They both needed help, and that was more important. What are the odds of both getting ill at the same time? They divorced 20 odd years ago, 12 year age difference and live miles and miles apart...
Both are now recovering nicely, one from a serious back-operation that luckily went OK, and the other recovering from a major cancer operation. That one was touch-and-go!
Anyhoo.. I have again found time for the camera, allthough I've missed most of the summer and insects I had hoped to chase

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Just before my "break" I bought the Sigma 70-300 4-5.6 DG APO Macro. I am beyond satisfied using this, but I have one "problem"..
When using the macro function (200-300mm focal length), I find it incredibly hard to keep the camera steady. Of course using a tripod, but this fastens under the camera and does not help much stabilizing the lens (in my opinion).
What would be my best solution?
Buying a better tripod? (Current is a bit "thin".)
Getting a lens-mount? (Is this even possible/available??)
Get a grip
Hope someone can enlighten me a bit, as I really would like to use this for macro. (Dedicated macro is still a few months off...)
Sincerely,
Geir Andersen