Blót – an offering – is a tactile way of expressing a wish or a promise. Whether your blót is received in a parallel world, or you simply enjoy giving and performing a ritual, is up to your own belief or experience. No one interferes with that.
Traditionally, the “gate” to Ásgarðr is water or fire, but if you’d rather bury your blót or offer in a completely different way is entirely up to you. Perhaps you would just raise a toast to the Ása or Ásynja that suits your mood and wishes.

Ásatrú has no organization, no holy book, no clergy, no consensus, no prohibitions, and no requirements.
The rituals are yours to decide, depending on what works for you.
When Christianity came to the North, it became known as “Inn Nyi Siðr” (the new ways), and thus Ásatrú – which had no name – became “Forn Siðr” (the old ways). Ásatrú (or Asatro) is a fairly new name.

Ásatrú isn’t an unchanged continuation of the religious traditions of the Viking Age, as we do not know exactly how the faith was experienced and practiced a thousand years ago – though, obviosly, many take inspiration from the old Norse culture and present folklore.

In modern times, it has become necessary to register Ásatrú as an official religion in order to be allowed to perform certain rituals that have formal significance, such as marriage, naming and burial.
Here you can find links to the state-recognized Ásatrú organizations in the Nordic countries: Gatherings.

Note that even these organizations do not interfere with what and how you believe, and are open to adapting rituals, etc. to your personal wishes.