The grammar pattern ようでは(ようじゃ) is used to express a conditional meaning of "if it is the case that..." or "if things are such that...", typically followed by a negative consequence or criticism. It conveys the speaker's judgment that if a certain undesirable situation is true or continues, then the outcome will be bad.
The pattern attaches to verbs, adjectives, or nouns that describe an undesirable state of affairs. The clause that follows almost always expresses a negative evaluation, warning, or concern.
ようでは is used in formal or written contexts, while ようじゃ is its more casual, spoken equivalent.
The key nuance is that the speaker is criticizing or warning about the current state. It implies "if things are really like this, then there's a problem."
~ようなら is a related expression that also means "if it seems that..." but is more neutral in tone – it can be used for both positive and negative outcomes. In contrast, ようでは almost always implies a negative judgment.
The above sentence uses ようなら neutrally (giving advice), whereas ようでは would sound more critical.