What matters for strength training is that you are genuinely challenging your muscles at close to their maximum potential, not what equipment (if any)you are using.
You should aim at an exercise that is challenging enough to fatigue your muscle (ie. you feel you cannot do another rep with the correct form) in 12 reps or less. Once you can do 12 reps, it is time to move up to something more challenging.
If your existing bodyweight exercises are too easy, there are many more challenging variants out there - for example, single leg squats or decline pushups are more challenging than the regular variety.
You can make resistance bands more challenging by doubling them up, or shortening them by standing on them or tieing them off.
The reasonable man adapts himself to the world; the unreasonable one persists in trying to adapt the world to himself. Therefore all progress depends on the unreasonable man.
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