First time solo travel to Portugal and Andalusia

I'm 27M from Canada, planning to finally go on my first solo trip from late April to early May for 10-12 days. After some research, I ended I choosing Portugal and Andalusia. This is my drafted itinerary:

Fly to Lisbon (stay for 4 Nights)
Fly to Seville (stay for 2 nights)
Train to Cordoba + Granada (stay for 2 nights)
Train to Seville and Fly to Porto (Stay for 2 or 3 nights)
Fly back from Porto

Is that enough to visit each city? I don't know if it's a good idea that I added Spain to my itinerary? I could spend the whole trip in Portugal too. But I was like now that I'm close to these cities visit them too. Previously I've been to Spain (Madrid and Barcelona) and I fell in love with the culture, food and architecture. I love to experience that again.
Would appreciate your tips on how to schedule my trip as a first-time solo traveler and if you have any other suggested destinations.
I'm looking to visit culturally rich cities with history, meet new people and enjoy food. Not much into the party scene and drinking.