There is a rejoin match button that shows up on the main menu if you get kicked or dropped before the match is over and the rejoin process is extremely fast.
You are stuck with a terrible connection. That is the problem for you, which unfortunately you are knowingly bringing to the match with you, which then makes it everyone else’s problem.
“Where’s Genji?”
“Oh, he’s running in place over there next to that statue. It’s cool, just don’t die in this 4v5 for the next 45 seconds while he reconnects and also please be patient while he runs back over from spawn.”
“Also it’d be really cool if you didn’t kill him, he disconnected and that’s just unfair farming cuz he can’t defend himself.”
“…better yet can everyone stop for a few? He has to turn on his hotspot and the battery died and he has to find the charger cuz someone borrowed it.”
“Ok sooooo awkward, the hotspot won’t turn on unless the thing has more than 20% charge, just hang in there everyone!!”
I think the main difference here to keep in mind is that this is ranked where there are crucial game moments and even though the time it takes you to reconnect is under a minute it’s enough to be really disruptive, especially if it happens several times in a match. I had a tank that rejoined my game probably six different times, lagging out in spawn most of the time. Quick play format as well as the upcoming quick play for stadium may be more forgiving for your situation, potentially.
Ranked just isn’t a possibility for you right now because your internet connection is going to hold you back and it’s not right that it could potentially hold others back too if it were to allow you to continue.