However don’t be fooled into think that this is as simple as it seems. A lot of research needs to be undertaken in order to determine your keywords and then to register a top-level domain that qualifies for those keywords.
The 60 expired Tumblr blogs that you mention may have had a 30PA rating but that doesn’t mean they will offer a great deal of ‘link juice’ to your current cause.
If you are looking into ranking with long-tail keywords or low competition keywords then you are still in with a shot.
Here is a more detailed guide to getting started, but be warned, this is a long process that is rewarding only when you follow the steps accordingly.
Side note: take extra caution with interlinking posts as an over saturation will be detrimental to your results.