1. I am BH9. With Gold Pass, my current storage capacities are 3.9 mil and 4.3 mil respectively. You won’t need more than 3.9 mil.
2. Rush to BH6 ASAP to unlock a second builder in Builder Base.
3. Save Clock Tower Potions as much as possible until then.
4. Always buy Clock Tower Potions each week wtih Raid medals.
5. Do not upgrade Clock Tower past level 6 yet, it’s just not worth the upgrade time.
6. Do not upgrade Gem Mine too much, as the extra gem generation is not worth as much as unlocking 6th builder sooner.
7. You only need to upgrade Barrack until you unlock Baby Dragon, maybe Night Witch if you prefer that.
8. Do not use Book of Heroes on Builder Base heroes, even if they save more time than Archer Queen with Clock Tower time taken into consideration. I made this mistake twice. I thought since using Books on Builder Base heroes unlock an extra builder sooner, it saves time just the same. But I was wrong: because Archer Queen is still the biggest time bottleneck, having extra builders does not matter. By not using Books on Archer Queen, you are wasting time and more importantly, potentially missing the next “cycle” for Book of Heroes Archer Queen upgrades (having to use Books for 4 day upgrades as opposed to 5 day upgrades, for example).

Just unlocked 6th builder on my 80th day of playing. I’d like to share some tips