Eu sou solteiro agora, então viajo mais no fim de semana.

Because solteiro describes a personal status/identity, so Portuguese normally uses ser, not estar.

• Eu sou solteiro = I am single
• Eu estou cansado = I am tired

A simple way to think about it:

• ser = identity, classification, more inherent description
• estar = temporary state, condition, location

Even though being single can change, Portuguese still usually treats relationship status with ser:

• sou solteiro / sou casado / sou divorciado

Yes. In Brazilian Portuguese, subject pronouns are often omitted when the verb already makes the subject clear.

So both are natural:

• Eu sou solteiro agora, então viajo mais no fim de semana.
• Sou solteiro agora, então viajo mais no fim de semana.

Including eu can add emphasis, contrast, or clarity.

Because solteiro is the masculine form. The adjective changes according to the speaker’s gender.

• A man would usually say: Eu sou solteiro.
• A woman would usually say: Eu sou solteira.

The same applies to many adjectives and status words in Portuguese:

• casado / casada
• divorciado / divorciada

Yes, agora literally means now, but in this sentence it really means something like nowadays / at this point / currently.

So:

• Eu sou solteiro agora = I’m single now / I’m currently single

It does not necessarily mean right this second. It often refers to a present situation.

Here então means so, therefore, or as a result.

It connects the two ideas:

• I’m single now
• so I travel more on the weekend

Common meanings of então include:

• so / therefore
• sometimes well then
• sometimes then in sequence, depending on context

In this sentence, it is clearly a cause/result connector.

Because viajo is the conjugated form of the verb viajar for I in the present tense.

Present tense of viajar:

• eu viajo = I travel
• você viaja = you travel
• ele/ela viaja = he/she travels
• nós viajamos = we travel
• vocês viajam = you all travel
• eles/elas viajam = they travel

So:

• viajar = to travel
• viajo = I travel

Mais means more.

So:

• viajo mais = I travel more

It suggests an increase compared with before, even though the sentence does not say more than what explicitly. The comparison is understood from context:

• now that the speaker is single, they travel more than before

Because fim is a masculine noun.

• o fim = the end
• de semana = of week

So:

• em + o = no
• no fim de semana = on the weekend / at the weekend

You use na only with feminine nouns:

• em + a = na

For example:

• na semana = in the week

In Portuguese, no fim de semana is often used generically, like on the weekend.

So this sentence can mean:

• I travel more on the weekend
• or more naturally in English: I travel more on weekends

If you want to emphasize repeated weekends, you can also say:

• nos fins de semana = on weekends

Both are possible, but no fim de semana is very common in everyday Brazilian Portuguese.

Usually it means I travel more on weekends in general.

That is, weekend time is when the speaker tends to travel more. It does not necessarily mean every single weekend, just that weekends are the time when they travel more often.

If you wanted to sound more clearly habitual, you could say:

• viajo mais nos fins de semana

But the original sentence already sounds natural and understandable.

Because então is linking two related clauses, and the comma helps separate the ideas clearly:

• Eu sou solteiro agora,
• então viajo mais no fim de semana.

This punctuation is very natural in Portuguese, just like in English:

• I’m single now, so I travel more on weekends.

Yes. Portuguese often uses the present tense for both:

• what is true now
• what someone habitually does

So in this sentence:

• sou = present state
• viajo = present habitual action

This is very normal in both Portuguese and English:

• I’m single now, so I travel more on weekends.

Not directly in the same structure, because porque means because, which changes the relationship and usually the word order.

Original:

• Eu sou solteiro agora, então viajo mais no fim de semana.
• I’m single now, so I travel more on weekends.

With porque:

• Viajo mais no fim de semana porque sou solteiro agora.
• I travel more on weekends because I’m single now.

So both can express a similar idea, but they are not swapped word-for-word.