Multiplayer game on one server. (Forza Horizon 4)

Hello everyone, the next problem I played myself for a long time now a friend joined the game, naturally, his rank is lower and the season is different for him; winter; I have summer. When I was there he translates into his season, then at the end of it back to mine and immediately back into his.
Already hesitated to play like that, maybe there is a solution, tell me.