To work on technical things like alignment/stance/straight stroke is a hard provement. Here i usualy recommend 5-10 minutes a day.
There are so many drills-hard to recommend a special one. And especiall without knowing your abilities. The advice for the PAT Series (1-3) is a good one. I like them a lot- for me it s more about to see where i have to work with someone. But to play 1 or even Pat2 completley under pressure and concentrated is a challenge for everyone (A Player woudl recommend 2 or 3, 3 is really hard!).
For example: i booked to play 2 tournaments for the beginning of last year. 3 weeks before i started training seriously. 5-10 minutes just technical fundamentals- and then about 1 hour just technical drills.
Every 2nd day i played a complete PAT 1 or PAT 2 test.
In the evening then i played some sets with guys in the clubhall. Worked good for me. 9b 3rd and 10b 1st place.
The most important thing-and wondering i don t hear it really often is, that you NEED to have a TARGET for your training what you wanne reach!
lg
Ingo