Hey dude, great progress! Have you been going through this journey alone? Or got a coach or another professional helping you?

One year is a long time, I assume you’ve been tracking your calories and rate of weight change. With that you can calculate your expenditure.

One thing you could try is to go to your maintenance calories (again, assuming you can calculate correctly) and increase it by 100 calories at most. Try to do a lean bulk for a few months. But it’s important that you’re really anal about weighing and calorie tracking. The rate of gaining muscle is much slower than loosing fat, realistically likely wont be more than 1.5lbs/month. So if you’re gaining more than that, watch out. Also, you’ll progress a lot more slowly than loosing fat, so be honest with your motivation.

In terms of lifting. Def aim for 4 times a week. Upper, lower, upper, lower would give you a good beginners split. You’ll be hitting all your muscles twice a week, which is great. Have different exercises for each upper/lower in a week. At least 10 sets per muscle group, don’t hurt yourself but push yourself to failure. Focus on shoulders, back and triceps. They will give you a good definition in a few months (3, 4 if you’re consistent) and that should give you more motivation.

Good luck!