In my early days in trading i used to be stuck with this problem ,where my balance in not enough to carry out the trade, and instead of looking for a lower tier I will just stick it that way. But now that am well informed I don't commit such error any more
I believe, this will be one of the learnings that a crypto trader will acquire at the beginning.
At some point, we will understand that each exchange has their own minimum amount of trades.
Just like for example, binance, most trading pairs, you can execute at the min of 10USD equivalent.
So if your coins are below in that amount, you can't trade and need to add more if you want to complete your order.