If it is a popular rugby team, you don’t need to do brand awareness. You should just focus on conversions. Upload lists of past season buyers and just past ticket purchases into Google and Meta.
I would look at search ads and maybe YouTube, if there are a lot of videos of the team on YouTube from the team or fans. Look at using YouTube for remarketing and not prospecting though. Lots of people could be searching for past games highlights to watch. Meta just focus on conversions objective campaigns.
Give each platform $5,000 in month one and see what works across both platforms. Increase budgets as campaigns start to work on both platforms. If the season is a few months away, you likely want to spend more money towards the last month. I image some season ticket holders don’t buy right away. Understanding how season ticket holders buy ticket would help you map out a better budget distribution plan.