No effect on meditation.

To be honest, I've been meditating for several years now. Sometimes I take short breaks of a few weeks, but in previous years when I started, just meditating for 5 or 10 minutes was enough to give me a strong sense of inner peace, I'm currently finding it very difficult to meditate and I feel like I'm not experiencing the same effects as before.

Any recommendations for meditation, something "advanced"?