Critical mistakes

I sometimes make them. I recently forgot to enrichen mixture before takeoff. It was the first flight after more than a month break. It's making me question if I can trust myself not to make these kind of critical mistakes.

I mean, what will I do next? Will I forget to put the gear down? I strive to use checklists religiously, even built my own. But this time I did everything but go rich. It happened because I purposely leaned for the backtrack taxi before takeoff, something I do very rarely. My routine to check lights, flights controls, T/O configuration, mixture, fuel tank and time before takeoff didn't get triggered in me once I swung the plane around and I just took off. Probably damaged the turbo - will have to see.

It seems to me, any time I do something that I don't do often, when there's a break from routine, I'm highly susceptible to making these kind of mistakes. I remember I sometimes forgot to do a proper before takeoff briefing when at a completely new field. I blame my instructors for some of this. Checklists were not taught to be used religiously for all phases of flight from the very start other than the before takeoff. I had to teach myself to use them in flight and I still struggle with actually doing it.

Do you trust yourself not to do these kind of mistakes? The big ones? I mean, I can't forgot about the seasoned top gun pilot Dale "Snort" Snodgrass and how he forgot to remove the gust lock and killed himself. If he could do such a simple yet critical mistake, what chances do I have as a low time PPL? My mistake for sure shortened the life of my turbo if not worse, TBD, but what if next time I do something worse with graver consequences?

Any thoughts? Any tips?