It took me quite a while to find a good website. There are plenty of puzzle resources out there, but most of them have the exact problems you described. Something always feels inconvenient. These days I use MJP jigsaw. I don’t do puzzles every day. For me it’s more of an activity for when I’m really bored, have nothing to do, or I’m traveling and once again can’t think of a better way to pass the time. But there are no ads there, and the site works really well overall.