[...] You can use neodynium magnets for increased traction, but you have to be careful, those magnets are really strong. If they're not fastened correctly they might get stuck to the dohyo.
Seems likeyou overlooked the...
[...] As i know the arena is make of aluminium and magnet cannot pull it.
Besides, with fixed mounting of magnets and a steel floor, magnets will probably be more of a nuisance to the user, that will have the increased drag for the full time, compared to the opponent, that only needs extra power for pushing it when it actually does.
All else equal, the better you spend your power budget, the better chance you have.