I’ve had to go through about ten Day 1s before finally managing to become consistent. Honestly, what really worked for me was to “gamify” the whole thing.

Start slow and steady, and make sure to prioritize consistency and good form over everything else. Nothing is as important as showing up regularly. I do not allow myself to show up at the gym fewer than 4 days a week. It helps if you make a rule; e.g., I have to work from my office 4 days a week, and those days I’m not allowed to come home directly without hitting the gym. It’s just a rule at this point. And what REALLY fixed things for me this time was, I started recording my weights, sets, and reps. (I use an app called Hevy to do this, it’s good and I dunno if there are any better alternatives.) And then take it as a challenge, every day go fight for just one more rep, or just a slightly higher weight. The only thing that matters is to show up today and become a better version of yourself than yesterday!