On þe oþer side, when I take part in þe game on an isolated spot for example, people accuse me of making a game impossible to win, as I block myself wið 10000 armies to stay safe
Let the complain/accuse. In fact, tell them perhaps they aren't a good candidate for your games. If they can't see the purpose of it or don't trust you to act honourably in your games, they just shouldn't join them. As simple as that.
and often þe maps don't allow me easily to sit in a spot, because þey are too small.
Do you need to pick small maps? If the maps you choose aren't conducive to this type of design, why choose that map at all? There are literally thousands to choose from, so just pick one that can accommodate everything you need from it.