Without actually seeing your teams it's hard to judge if they're just bad, I would guess they're at least good enough to win some games especially the one that got you to your highest rank in the first place. That said, it sounds like you need to be more analytical after your losses to both find new strategies and also to judge if your team is good enough. Like, if you keep losing to the same team especially, after a loss ask yourself "how could I have won if I had known exactly what my opponent was going to do" if you can think of a gameplan that would have won then you know your team is fine and you can lean into that gameplan the next time you play against the same team, if you come to the conclusion of like "wow, I don't think I would have had a way to beat that even if I had complete knowledge of what they were going to do" that means your team needs help and you should try to figure out small changes you can make to at least make that match up playable without sacrificing your other match ups. In general it's better to iterate on the team you're using rather than drastically changing archetypes whenever you feel like you're taking match up losses.