I would say less games and more studying, analyzing and solving tactics puzzles will most likely be better.
So depending on how much time you have available, about 1-5 games a day and at least the same amount of time or more spent on puzzles, studying and analyzing.
So if you have about one hour, then do a couple puzzles to warm up, play one 15|10 game, analyze the game, do one lessons here on chess.com for example.
If you have 2 hours, maybe do a little more tactics, play two games, analyze, study some endgames.
If you have three hours, some tactics, 2-3 games, analyze, go through an annotated master game.
Something like that is what I try to do, but of course the study "program" I have is quite flexible and these are just examples.
Now I am going to try another method to improve my endgames. I'll start going back to the games where I had a winning or drawn endgame that I managed to lose. Get to a point in the endgame where I was still winning or drawing and try to play it out against the computer from that point on. There is that option under the analysis tab, when you go through the games. I am hoping it will help me improve my endgames and avoid unnecessary losses.
Is there a sweet spot? I try to play 1-2 games a day but I go back and analyze each to try and understand where I played strong and where I can use improvement.
Any feedback is appreciated. Thanks!