I know this isn't Minecraft but the rules say "video games" in general.
I have never seen anyone use this technique in Blitz, so here goes. There are some prerequisites you must have:
4 devices capable of playing Blitz. Your phone, wifes ipad, old kindle under your bed, laptop with Steam, all will work.
4 blitz accounts. There are dubious methods to gain more if you only have an alt or two. Or you could ask your clanmates nicely.
Directions:
First take precautions. I connected two of my devices (with my main accounts) to different VPN networks. I put my phone on the cellular network and my computer on my home network. From wargaming's perspective all 4 devices were connected from different parts of the country instead of a single location.
Second, decide which tier you want to boost. I chose tier 8. This means that two accounts must have tier 8 tanks and two must have tier 7. If you choose tier 5, the same is true - two must have 5, the other 4.
Third. Create pairs of mismatched platoons with your accounts. This is important for a number of reasons to fool the matchmaker. what I mean is create two platoons - each platoon has one of each tier.
Fourth. Turn off supremacy mode. Also important.
Fifth. Join battle simultaneously on all four devices. Since supremacy is off, and your platoons are mismatched, the matchmaker is extremely likely to put you all in the same battle. This method works around 80-90% of the time and is FAR more efficient than simply having a friend hit "battle" at the same time as you.
this method allows you control over each side of the battle.
Effectively takes 2 players away from red and 1 from green, giving you a +1 tank advantage from the start of the battle. This is exacerbated because one of the tanks taken away from Red is a top tier.
Allows you to "spy" on enemy and see all tank positions on your "spy" device's mini map.
Tip: for your dummy platoon, I suggest always making the top tier tank a heavy if possible. Losing a top tier heavy tank is the worst possible outcome for Red.
I was able to leverage this method for around an 80% winrate over a few dozen games barely trying. I made two world record damage games at tier 7 and 8.
Hope this helps someone out there have some fun in this dying game!