Itinerary help, 3 full days in Sevilla

We saw the Cathedral and Alcazar on the same day. Went to the Cathedral with timed entry as soon as it opened around 10:50. I decided not to climb the tower. My sister climbed the tower, and took about 45 minutes. I toured the cathedral. By the time she came down, the cathedral was PACKED. So go early and see the cathedral first thing. It is HUGE. I’ve been to a lot of cathedrals and had no idea it is so massive (and interesting!).

We did a tour of the private apartments at the Alcazar and really enjoyed it. The grounds are very beautiful as well. We had lunch near the gardens before our guided tour of the apartments. Then wandered in our own. Those two took up a good portion of the day.

Plaza de Espagna can be done at any time. We went one morning, before it got too warm. Then we had lunch and walked to the Casa de Pilatos. Enjoyed that as well.

Sevilla Aquarium
Triana Ceramic Museum
Centro Andaluz de Arte Contemporáneo
Military Historical Museum of Seville
Seville Museum of Fine Arts

And
https://tallerandaluzdecocina.com/

We also were in Sevilla last September for 2.5 days/3 nights. The highlight for us was the rooftop tour of the cathedral. In fact, that was a highlight of our 17 day Andalucia roadtrip! Unlike others, we were underwhelmed by the Alcazar and the Centro Cerámica Triana. Plaza de Espana and the surrounding park are beautiful and massive. You could spend just a little, or a great deal of, time there. We especially enjoyed wandering the neighborhoods (we stumbled upon a small, religious procession and locals dancing joyously in the street), walking through Las Setas, the churros at Bar El Comercio and, unexpectedly, our hotel - H10 Casa de Plata.

We did the same as above but also
Took a cooking class
Took a flamenco dance class
Toured the old bullfight arena
Went to a Real Madrid football (soccer) game
Went to the bull fights