What’s a good way to get my C++ skills back?

Pick a small program with a few connected parts instead of doing only isolated syntax puzzles. A text-based tic-tac-toe game is a good starter: store and display the board, read moves, check for a win or draw, and add a simple computer opponent if you want a stretch goal.

Build it in stages, and look up language details as they come up. That gives you practice using C++ while also giving you a concrete reason to revisit the basics.

For short, self-contained exercises, try an online problem set such as Beecrowd. Start with the easiest problems and focus on writing clear solutions, not racing through them. Once the basic input, loops, and conditionals feel familiar, move on to problems involving functions, containers, and algorithms.