Umm, get a 4th or 5th builder on your current account? Even if you don't, the amount of time you will save creating a new account with 4 builders will not come anywhere near making up for what you will be giving up by restarting.
~Jeff
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Restart. Follow rule of thumb.. Max ur defenses n save th for last.
Just continue building on your own base bro, don't want to chuck away all that hard effort!
If you will buy gems: stay with this and buy the last 2 builders now. If not, you may consider restart afresh and save every gem (even not spending a gem during tutorial) and rush to TH 5 then 7, then try to get the 3rd and 4th builder.