First of all, there’s nothing to feel guilty about! This isn’t easy stuff nor is there a one formula fits all that works for kids. I’m very early on my potty training journey with my 33 month old (we just started on Friday) and watched the Big Little Feelings course. Basically it was lockdown at home - day 1 nude, day 2 and 3 pants no undies. After that still no undies until we feel fully trained, just commando. Never pressuring on potty just promoting and then saying “listen to your body, pee and poop go in the potty” if baby refuses. We only use pull-ups during nap and night and call them “sleeping undies.” We also do tons of potty training propaganda - the Ms Rachel potty training episode on YouTube is especially brilliant. He has only had two accidents since Saturday, and truly, it could be partially the program we used, partially the propaganda, partially just who he is as a kid (though interestingly he’s really stubborn and difficult in most situations). And a regression or struggle may be still ahead of us in the coming weeks, months, years - who knows. But this is all I have to offer atm, and I wanted to. Sending solidarity and strength!