The four goals you’ve listed are great. I know a lot of elderly players who are just content with the goal of going out there and having fun with their friends, but you’re clearly more ambitious than that.
Which one you pick soley comes down to how much time and physical investment you’re...
It depends how you achieve it. Realistically you want to be striving for a pretty consistent swing speed and just varying the pace-to-spin ratio. Some 3.0 to 4.0 players can do that, others can’t.
If you can’t, then the only way you can vary your pace is by consciously altering your swing speed...
This is not something I would make a big deal about. We often play matches on courts where the lines are not chalked to regulation width. As long as the conditions are mostly reasonable and the same for both players - no harm, no foul.
Money is only part of the issue. Cutting a work trip short and missing a work related conference impacts your paid employment even if you use vacation.
I realise this may not be the case at your grocery bagging gig.