Hi there
As a former teacher I have come across a lot of children who find handwriting difficult. I used to suggest building up strength in the hand muscles as sometimes poor muscle control can contribute to poor formation. Things like threading beads/lego/playdough/sewing cards etc. can help.
Then we would work on letter shapes/patterns e.g. circles, continuous zig zags, continuos m shape... like this mmmmm but joined up so you get a run of little arhces. Hope that makes sense.
Once the strength had built up, we would work on letter formation every day (little and often) for a particular set of letters which are similar to form e.g. c, o, a, q, d OR l, i, OR n, m, h, b (can you see how they build up? I would never teach handwriting goign through alphabet sequence as letters are too different from each other in sequence) and once we'd gone through all letters in alphabet and correct formation, THEN I would encourage the child to concentrate on size, position on line etc. And they need to be shown exactly what is meant by "keep it on the line" or "make it smaller" and an adult would role model by writing the correct size/position and watch the child do it. I have often seen children be left to do "handwriting" practice in school and no adult guidance given, this did not work as the child did not know how to change/correct their writing.
Also, little and often is the best way to teach handwriting. You can make it more exciting by using different pens/pencils or even use paint or water in washing up liquid bottle to squirt out letter shapes outdoors - (better in dry warm weather
) children love white boards and marker pens (can be rubbed out too so non-commital) so mabe invest in this? or to reinforce the letter shapes, get your child to use cooked spaghetti strings/plasticine/string to make the letter shapes.
Hope this helps.
BF x