I’ve found that sometimes you can’t get enough torque while holding the flywheel strap with one hand and tightening with the other. Asking a friend to hold the flywheel strap while you put your efforts into tightening sometimes helps. Using a longer extension handle/breaker bar or slipping a piece of pipe over the end of the handle can give you a bit more torque as well. Also use upward force on the flywheel while you give the top of the puller bolt a sharp blow. I’ve used a pry bar like in the picture and whacked the bolt, turn the flywheel a little and whack it again, repeat all the way around if stubborn.
Edit: to be more accurate as Steve A W mentions below don’t "pry" but lift up to take out slack in crank…helps avoid damage to bearings, etc.
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