Replace the old shower head with a handheld shower on a hose.
If possible, buy one with a "trickle control" on the handle that lets you turn the water flow to a trickle so you don't waste water while "soaping up."
If you're handy and can screw it on yourself, the cost is less than $100. If you have a plumber install it, cost will be about $175- to $200.
Install a sturdy grab bar on the wall where you step into the shower or tub. At one of big box stores you'll pay $30 to $60 for a nicer bar. If you have a pro install it, expect to pay $175 to $200 per bar, including the bar itself.
And more.....