You know that you spend a lot more time complaining then trying to find a solution. If you do actually care about being solution oriented, then post your roster and let us brainstorm a solution. I promise you that these types of team compositions can be dealt with
Or alternatively, just keep complaining. I guess that gets results too
Edit: And don't say that starting late is the reason you are struggling in Arena. There are many videos of content creators that frequently re-start brand new accounts, and can make their way into Gold 5 over the course of a couple of months. It's not about being late to the party, it's about knowing the game and understanding the mechanics. If they can do it, then so can you, as long as you are willing to explore solutions.
An example of a CC that has done this is Hell Hades (https://www.youtube.com/c/HellHades/videos), who has started his second FTP brand new account about 4 odd months ago I think, and is not only in gold 5 arena, but has also participated in two fragment/fusion events.
Edit2: Actually, it was 5 months ago that he started his second FTP account, and you can check out the full journey here: https://www.youtube.com/watch?v=iuAngaRwbkI&list=PLUIeSAUVoCqLKkjY90KksbGMFD-wndDC2
Edit3:
Note that these were back when Arena was much harder than it is now, but still it gives you an idea
24 days in, he was in Silver 2 Arena: https://www.youtube.com/watch?v=DQNnIaM4GnI
32 days in, he was in Silver 3 Arena: https://www.youtube.com/watch?v=iArXeVjksLE
60 days in, he was in Silver 4 Arena: https://www.youtube.com/watch?v=mFLZiY11jGc, though he was distracted for 3 weeks with other things on his main account, including a guaranteed Krisk event, so I actually think he would have gotten there earlier
78 days in, he was in Gold 2 Arena: https://www.youtube.com/watch?v=7MnVNNZDYv4
Also note, I really am not trying to have a go at you here. I'm trying to give you videos and information that you might find useful. There is a thought process to how you tackle Arena. You just need to be willing to have a solutions oriented discussion about it and start by posting your roster