If there is not a basket in the back garden or one near by then find a wall then find a brick that is 10 feet off the wall and practice shooting at that.
If you can’t find a wall then shoot at a spot on the floor.
Use a variety of techniques before shooting such as spinning, bouncing the ball in front of you etc.
Four players standing still make every ball handler's job harder. Teach V-cuts, L-cuts and back cuts so your team gets open and punishes defenders who overplay.
Good team defence is five players guarding the ball, not five separate one-on-ones. The shell drill is where that starts, so here is how to teach help-side positioning and rotations from the first week of the season.
Rebounding is the least glamorous thing in basketball and one of the most decisive. It is also almost entirely a habit, which means it is entirely coachable.