Defeat to Slovakia on Thursday means Northern Ireland go into the hat for the final round of playoff qualifiers.
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"I think we've come on quite a lot in the last few campaigns, the Nations League and this campaign and I think we just need to try and keep continuing on that upwards trajectory," said Bradley.
"We definitely won't fear anyone. I think it's all to play for and it's two games away from a World Cup so there's no point fearing anyone."
He added: "It's nice to get a play-off. Obviously it's going to be brilliant.
"It's going to be difficult, but we're really looking forward to it. We're two games away from being at a World Cup which is pretty special."