Contributing to the TYPO3 Board is a significant responsibility, demanding an average of 0.5 to 1 day per week. This involves (list is not complete and not sorted by amount of work):
- Regular board meetings
- Virtual and in person meetings with teams and groups
- Quarterly multi day in person meetings with the board
- Attendance at key TYPO3 events
- Actual board-related work
Do you have the resources to fulfill this?
Since you are already a board member you already have proven it - so a simple yes might be enough 
.