When you see 'Not enough funds to place buy orders' in the trading bot output of your trading bot, it means you don't have enough funds in the selected quote currency.

You can either sell your existing open positions or wait until the trading bot sells positions. You can also lower your 'Minimum trade amount' in your Base config's buy settings, but be aware of the crypto exchange's minimum trade amounts.

Alternatively, you can always deposit more funds of the quote currency via the crypto exchange.