Freelance and contract project managers sell control of other people's money and deadlines – and when a programme overruns or a delivery fails, the PM's decisions are in every retrospective.
Name your domain when you buy – "project manager" is a title, not a risk – and match limits to the contracts in front of you. Keep decision logs and RAID documentation religiously: in this trade the project file is the claims defence. And keep cover continuous across bench time; the claim from your last programme doesn't check whether you're currently billing.