This, this, this, audio matters!
It doesn't matter how good your presenting voice is or your video editing skills are, if it sounds like you are in a tin can it's just unbearable to listen to and no amount of post production can ever fix it.
The solution doesn't have to be crazy expensive, the difference between simply having people individually miced up and not is huuuge, that's ~£20 or less for a decent wired lavalier. Don't fall down the rabbit hole of mic quality, the difference between using a personal mic and not is the largest voice audio quality jump you will ever achieve, just buy something that you can pin to yourself, make sure it works consistently, preferably that you can tell it's working when you are using it - and that's super good enough.