Tips for keeping strength while cutting BF%

Just track your calories and eat at a deficit. Eat what you want beyond that. Hit your individual macro goals if you can, that'll help keep your muscle's both energized and in good shape. As far as tracking your body fat %, try a set of calipers, you can find them under $20 on Amazon. Don't expect it to drop quickly. Took me about five months to drop 2% body fat once I hit my goal weight. As far as keeping your muscle mass, keep your protein levels up (I choose 1g/lb of my body weight, but you can go lower if you feel that works for you). I stay at maintenance calories or slightly below and just keep on pushing my normal workout routine. It's slow and tedious to get your body fat down unless you're willing to stay at a huge deficit and lose muscle along with the fat. I've worked hard to gain the muscle I have now, and want to gain more, so I refuse to eat at much of a deficit right now. But because of all the exercise and strength training I am still slowly gaining muscle and dropping body fat. It's just taking a long long time.

Eating foods labeled "organic" doesn't do anything for weight loss, fat loss or anything else. Neither do any other foods. Just watch your calories and macros, in particular make sure you are getting enough protein. I always lose strength when I'm eating at a large enough deficit. Unless you have a specific reason to keep a certain strength I wouldn't worry about it too much, whatever you can lift is still giving you the results you're after. Strength gains or losses don't equal muscle gains or losses.

Personally, I use calipers for body fat. Some pooh-pooh it but calipers have absolutely worked for me with consistency (I measure once a week) showing the measurements have been pretty accurate.

As for a plateau, one way to break it can be to increase calories for a bit- ("reverse dieting") maybe 80-100 a week... and see where that leads. Again, personally, I plateaued at 2300 calories (for months... we're not talking a couple weeks) and began adding a small amount every week. Busted the weight loss plateau, actually decreased body fat and dropped on the scale. Was still at a deficit, but not as drastic. Worked for me, anyway.

As for foods- foods that meet your caloric goals and energy requirements. If that's 160g protein, then your usual go-to protein sources will do. If it's 150g carbs, any carb source will do (with an eye on nutrition, of course) as long as you're in your caloric goals/needs.

If your protein shakes are calorie dense, they're probably more meal replacements. If you want to supplement protein, hit 90% ish protein content- that's usually in the neighborhood of 24-26g protein with very little, if any, fats and carbs and 110-ish calories.