The truth is Braga is not a title contender when it comes to the Portuguese league they have become a top four team and has not been able to break out from that place, this is because Braga are not ambitious enough to win and you can see that in their signing because a team that wants to win is known by the quality of players that they bring to their team at best Braga will end up finishing in fourth place behind Benfica, Sporting Lisbon and Porto.
This image clearly shows that Braga isn't a strong title contender. They're ranked fourth in market value, consistently finishing in fourth or third place at the end of the season. It's like a curse that they'll always be in that spot.
Whether they're playing it safe or simply lacking ambition, as you suggest, given the club financial stability and the support from Qatar Sports, they should be able to invest more to further strengthen their competitive edge.