Volunteering. Effective Altruism doesn't have as strong a culture of volunteering as other community groups. When we had access to massive amounts of funding we were able to substitute paying people for volunteering, but I think we're going to have to address this situation in the new funding environment.

I'd argue that EA is quite bad at something like: "Engaging a broad group of relevant stakeholders for increased impact". So getting loads of non-EA people on your side, and finding ways to work together with multiple, potentially misaligned orgs, governments and individuals. 

Don't want to overstate this- some EA orgs do this well. Charity Entrepreneurship include stakeholder engagement in their program, for example. But it seems neglected in the EA space more generally.