I'll gladly step out of everyone else's way for suggestions about other things to be getting on with.
But I would look twice at the simultaneous goals of increasing strength, dexterity and speed. Endurance, dexterity and speed would perhaps be a slightly happier mix.
That said, do you have any specific areas or regions of the body you wish to strengthen ? i.e the hand ? Is your hand weak as it stands ?
If you do wish to strengthen the hand, be careful to strengthen the muscles that release the fingers to the same degree as you strengthen the muscles that grip, or your finger release speed may be influenced.
Good luck with the practice
T