Keeping some form of log to document your progression is a great way to ensure you’re consistently improving.
Here are a couple of ways to help!
1) Keep a strength diary – write down weight lifted, reps and sets achieved each session. This way you’ll know what to push for next session.
2) Weekly weigh ins. Weigh yourself on the same day, at the same time and in the same clothes each week. Maintain consistency for accuracy.
3) Before and after pictures. Take snaps every 4,6 or 8 weeks apart to visualise your results and progress.