If you are a collector, trophies should not matter. Drop until you can get battles you feel are more balanced. Blow off any unbalanced battles where you go 0/3, hit the button again. You will drop and get a takedown here and there until you have 10 for the DBI. Two suggestions from someone who also does not care for Arena.
First, drop to a point you are facing same level/boosted creatures. Two ways to get there. First start a battle and put the phone down. Come back in a few minutes and hit battle again. You will get the occasional takedown until you have all 10. People you face get a ‘free win’ and only have to wait out the timer. Or, keep battling, taking those huge losses and drop a few hundred trophies.
Once you drop a bit, put in whatever fun crew you desire. I made a huge Apato that is amusing to toss into battle. Level up whatever you have the most common of, make a huge one and add it to your crew. What are you saving coins for? Once you collect a creature, you are done. No need to have a fleet of level 30 Unique. If you aim for that fleet of level 30, you are going to be right back where you are, facing those monsters folks purchased lots of boosts for.
Don’t go for a DBI all in one session. Do a battle here and there until you have 10 takedowns. Then, set on it until it is needed for a daily mission. Do a couple battles a day. Once a DBI is full those takedowns roll over. Once you open that DBI you will be surprised to find that there are 4, 5, or 8 takedowns towards the next one!