I'm going to make up for my failed vow a few years ago...and add some. I am going to finish my fire raptor, two squads of intercessors and a squad of hellblasters!
More than happy for you to volunteer for the Death Company
The Lost section is here and within it you'll find the link to previous events where you'll find your legacy vow. Note that this vow would need to be completed in its entirety before you pledge something else.
For example, last year was the first to use the volunteer method and I opted to finally complete an outstanding legacy vow (Land Speeder and Whirlwind from ETL 1 no less!). Once done, I was able to pledge for The Golden Host (TDA Captain) - basically mixing and matching breaks the theme we have in place and it's a pain on the admin