Alhamdulillah, Now Praying From Memory!

Assalamu alaikum everyone, Since September, I've been making a real effort to strengthen my connection with Allah. I was born into Islam, but only recently have I started to truly embrace and practice my faith with dedication. I began watching educational videos and committed to performing all five daily prayers. As a Muslim from the Balkans, this journey has been deeply meaningful for me. At first, I needed a lot of help. I asked a knowledgeable brother to share videos that broke down the Salah, and I kept notes nearby to guide me through each step. Alhamdulillah, by Allah's mercy, for the past two weeks I've been able to pray without relying on those videos or my notes. It feels like a real blessing. But, I'll be honest, there's still a little worry in my heart that I might be making mistakes in my prayer. My main question is about a specific part. In my prayer, I say "Rabighfirli, firli." However, when I looked it up, I found some people saying "Rabighfirli" three times instead. This has left me a bit confused about which is the correct way. I would be so grateful for any guidance or advice you could share. JazakAllah khair for your help and support.