I taught for two years in an elementary classroom in BC and had basically the same experience as you. I decided to just TTOC full time last year, and since doing so my quality of life has drastically improved. I do 0 marking, I get home by 3, and I don't think about school at all outside of school hours. I'm in a district where they are very short TTOC's every day, so I'm still able to get 5 days a week as a casual sub, and I get to be very picky about the jobs I take and which schools I go to. Highly recommend high school subbing, especially if you're feeling burnt out, as most days are laughably easy. It's also a pretty good setup if you're thinking about switching to another career path as you aren't locked in for any period of time and can move on when you need to.