Am I eligible for H1-B visa 2020 (cap)?

hi, I came back to India on July this year and have already used 5 years 2 months of my H1-B Visa (no GC). Am I eligible to file H1-B visa 2020 (cap)?

Yes, you can. If you re-enter US in October 2019, you would have also stayed out of US for one year and you would get full 3+3 years again.