Didn't you ask this already? Haha. I could have sworn you decided to go with filshortage?
I could be mistaking for another individual who asked a similar thing.
I'll give you the low down the way I've experienced though, and maybe you can make a better decision?
Festivals cost money. You can find cheap ones, especially ones dealing with this virus, you just have to look them up. I searched COVID on filmfreeway.com to find some. But all in all, they still cost money.
Read the rules of the fest, make sure they say NO PREMIERE REQUIREMENT or something like that. That means you can both post it online AND submit to that festival. Note: some festivals will take preference to films that haven't premiered online.
If you want online distro, there are sites like Filmshortage, Short of the Week, Directors Notes. etc. My short scifi got denied by Short of the Week and Directors Notes. It sucks, really bad for me because how much work we put in, but I understand. They don't want an experimental SciFi, they want emotional, dramatic, political/climate films. Its a certain type of film they are looking for. (Or maybe my film just isn't as good as I thought).
Either way, that is a risk you take when submitting to fests and distributors.
Hope that helps?