Hi @Angel9097
I wouldn't recommend changing the prices manually - rather use professional hosting tools if you want to apply rates to specific seasons. This can only be done on a desktop and can take some getting used to, but here's the guide:
Professional hosting tools - Airbnb Help Center
You also mention that it's not only the season that's affecting your pricing, but also the fact that some groups are larger than others. You can consider whether per-guest pricing may be a good option for you (you could, in part, base your decision on what you see competitors in your area doing). If you want to test this, go to the Pricing tab on the Calendar. Scroll down to Additional Charges and look at the Extra-guest fee, which you can customise as you prefer.