I always recommend Rails or Laravel since I enjoy those.
Then build a basic web app to scratch an itch you have.
ToDo/Planner, Private Social Network for your close friends or family, Budgeting Tool, Tracking something you collect (Albums, Legos, etc), geo location is interesting, QR Codes maybe a scavenger hunt app for you and your friends (setup QR codes around town with clues).
Whatever you choose, use it, extend it, update it over time, keep a list of features and improvements you want to do. When you feel like coding pick one and implement it.
If you lose interest in your app. Start a new one.
If you want learn React, Angular or Vue on top of a Rails/Laravel app.
Buy a domain, use Git, Deploy your app to Digital Ocean to build up your skills/knowledge.
If you're interested checkout the StartUpsForTheRestOfUs podcast if you have an interest in starting your own thing eventually.
Good Luck, have fun keeping your coding skills sharp.
Also, bear in mind that the farther along you go in your career, the harder it becomes to switch tracks. If you go more than a decade without coding professionally, it may be hard to get yourself considered for a coding job by many employers without an exceptional demonstration of your coding skills.
I forget the code I wrote last week and how it works.
Gotta keep coding.
I'm not trying to be a snarky asshole: the best thing you can do is build some things.
Maybe you can start by automating some chore you do for work.