On the #NoSocialHate site, Mostert’s pledge cites a desire for people to set a "better example” amid escalating online bullying, which can lead to mental health issues.
While he said results provided glimpses of joy, Mostert acknowledged the struggles of the time on the road.
“Last year was super tough for everyone, especially the Victorian teams,” the 15-time race winner said.
“We were on the road for so long and we were away from our families.
“Different people at different levels of a team go through different levels of emotion and stress.
“Racing and getting great results can make you happy, but being away from your loved ones is hard, and it can get you down.”
While the time away provided its struggles, Mostert said his team’s ability to get through the tough times together paved the way to a successful 2021.
Already this season, Mostert has taken poles and race wins, and is within striking distance of his best ever championship finish.
The 2014 Bathurst winner claimed his first WAU win at Symmons Plains in April, before racing from 10th to win in Darwin.
“Last year for our team, we banded together and got through the tough times together,” he said.
“This year, we have achieved what we have so far because we grew so much together last year.
“We’re so lucky we have so many passionate people in our team, and in all teams.
“To go on the road and keep the show on the road… that’s pretty special.”
Mostert’s team posted a message to its accounts regarding R U OK Day, a move Mostert was proud of amid the pain of ongoing lockdowns in Australia.