According to History's website, a new season of "Alone" will drop on the network in June 2021. This is in line with most other seasons of the show to debut at the start of summer. In terms of production, it makes sense considering filming tends to begin in the autumn. The idea is that the participants have a limited window before winter starts, so it will either weed out the weak from the strong or convince people to fortify their accommodations before it gets overly cold out.
Most of the time, a winner has been decided between two and three months of a given season starting, so with editing, a June release date has been ideal. It's unclear if the COVID-19 pandemic impacted production at all, but if anything, this is one show that's pretty much pandemic-proof. All of the contestants are practically in quarantine anyway since they're not even close to each other, so it looks like everything has been able to stay on track within the last year.