If you're already getting the diet under control, and strength is not why you're lifting, take your usual weight, add a few sets to the main exercise of the day, and try to decrease your rest between sets. Challenge yourself to turn your weight session into an interval training session at the same time. Then make it a goal to reduce that already shorter rest by 5 seconds each week until your rest is slightly shorter than your reps.
My Training Log
Personal tips that I've learned along my still short journey:
Leave your ego at the door.
Prepare. Showing up dehydrated, hungry, and tired will guarantee failure.
Be ready to fight for that grinder of a PR.
Listen and learn. Absorb everything you can, and assimilate that knowledge.
Top Gym lifts: