Two of my 4 were doing high performance training in tennis for years.
They loved it, had great success and were hugely committed...until they weren't.
Until they decided that actually No, they didn't want to continue having to say No to things because they had a coveted place on a squad.
We accept it, and moved on.
I can understand the OP's indecision because these places are in high demand and if you are not attending you are taking the place of another child.
We missed many Saturday parties but they were happy to do that and made the choice to, until they made a different choice.
I think it is very important that it is the childs choice.
I wouldn't have wanted any of mine to look back and feel they were forced to do something ultimately they did not want.
But also I think it is important to fulfill your commitment and when the term ends to make another choice.
We finished out the year and when the invitation to return came we politely declined.
It definitely disappointed us as they both had such talent, but we hid it well and supported their decision.
They still play and enjoy it, but not at the level they once did.
Children's interests change as they mature, best to support that, rather than trying to live through them, which will inevitably come back to bite you IMO.