Unable to get erection & ejaculation.

Whenever I try to have an intercourse with my partner, I'm encountering erectile dysfunction. This is not only now. We just celebrated our 5th anniversary and we are planning to have our 2nd baby and I'm unable to be successful in my sex life. My 1st baby is 4 years and 2 months now. Need some suggestion on how to be successful in the sex life and how can I prevent my partner from disappointments? Should I need to follow any medications to make my libido harder and sustain the erection throughout the duration of sex? Each and everyday, whenever we try, we are under disappointments and we are getting into depressed level too. Is it good to take "Carbamide Forte Testosterone Supplement for Men with Tribulus 1000mg, Ashwagandha, L-Citrulline & Kaunch Beej – 60 Veg Tablets" which readily available in Amazon platform to boost my Testosterone level to have the erection and ejaculation successfully?