Productivity: Schedule/Time Management/Time Audit - How to avoid being rusty, but avoiding burnout and having realistic rest schedule?

From reading this, I feel like you're working too hard. Your weekends should be yours (at least mostly), and working past midnight isn't great. It's tricky as you need to find the balance between getting more done by spending more time and getting enough rest that you are functional and doing high-quality work. When spending more hours to get work done, you will eventually hit a point of diminishing returns that even goes into negative as you burn yourself out.

I would introspect on your task load and see what you can drop. Follow the framework here: https://www.jointaro.com/course/maximize-your-productivity-as-a-software-engineer/finding-the-best-things-to-work-on/

When it comes to personal life "overhead" tasks, here's what I do (and feel free to mirror if you have the resources):

• Instacart for grocery delivery - You can get a free membership for Instacart+ if you have the Chase Sapphire Preferred card. I almost always shop at Walmart in Instacart as they match the in-store prices. You can specify a 3-hour delivery window as well to save $2. Once you stack all of these, the price is very comparable to just going there yourself except you get to save a lot of time.
• Cook in batches - I almost always make 4-5 servings of food at once. My wife and I aren't too picky and are okay eating leftovers (i.e. don't need fresh food all the time).
• Do chores during breaks - When I can't keep doing work anymore and I need to rest my brain for a bit, I do a chore like vacuuming that is still personally productive but takes very little brainpower.