Need some encouragement

For all those who potty trained while caring for an infant just need some encouragement. I'm at my mental wits end.

I have a 3 year old son that would pee on the potty for last two monthsb when put on the seat. Now he won't even do that. Just screams" I'll try again later" and sobs. I used to take him every hour. We did MMs candy for rewards, stickers. Now I'm backing off. I have a 6m old also who needs a lot of attention (velcro baby)

He wears those padded underwear and a pull up when we go out. I am sorry, but the "pants off" method is not what I can handle right now. We have carpets.

For all who experienced this sort of regression, what helped? I don't yell at him obviously, I am trying not to get visibly frustrated and trying to keep it fun. But he has totally lost interest and won't communicate when he has to go. Just sobs on the potty and when he's wet.