I own a Sony a1 and a9, for my long lenses like the 200-600 I mount the vertical grip that helps to balance out the outfit. I also hand hold the lens just behind the lens hood, this too helps stabilize the lens.
You really should be able to hand hold the 105 macro without an issue, it is not heavy or big for a macro. I would not put a tripod foot on the macro, too cumbersome. I reverse the tripod foot on the 200-600 so it is easier to handle hand held.
I am 76 years young and have no issues hand holding my equipment, I also own the Sony 600 f4 and hand hold that without issue.
I find a tripod and monopod slow me down in wildlife photography. Below is an image taken of three Cattle Egret chicks and mom, hand held, at a 100 yards, with the 600mm f4.
I find my minimum shutter speed to be greater than 1/2500 sec. that way it helps hand holding and for birds in flight.
Good luck and keep on shooting until the end.