This is funny, why do you want to keep doing that? Will this not amount to wastage of your funds since they still belong to you, or just an effort from you without any value been added!
I've fractions of coins in multiple addresses so I was thinking to "put" them all into one single address, and now it seems that will cause the fee problem
Bitcoin transaction fees should not be a problem right now. If you are willing to wait for slower confirmation, you can set the transaction fee to low priority, note that this can only apply if this is not an exchange wallet, because some exchanges have fix transaction fees when withdrawing your funds, so if multiple wallets that you have is from an exchange then fees will be a problem. Anyway, low priority fees will not take long since there are no congestion on Bitcoin's network like before. If you are using a segwit address it will be more cheaper and faster.