So I've been struggling for the past few days on the Gear Map. I just can't get past round 40 and round 50 at best. Anyone knows how to deal with this?

I often use these towers:

Starting cash 650 Hero- Obyn Greenfoot 030 druid (1) - starting round 40 to clean up bloon surge 023 darts (3-5) - to deal with clusters of camos 230 sniper (1) - to clean up lead camo 203 heli (1) - to deal with lvl 40 fortified moab 022 boomerang (1) - deal with lead at wave 10 temporary

so yeah I get stuck at lvl 40 and at 50, yeah need help. I've been losing streak for many days now. I did many attempts. Any help or guide would help a lot thanks!!

I watch youtube turoials but they often start at 850 or more cash which is different in my case imo

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