Found 12 stronger alternatives to upgrade your writing.
Reason (clause)
Nuance: Reason
Common in writing; slightly more formal.
Boring
We stayed inside since it was raining.
Better
We stayed inside as it was raining.
Reason (clause)
Nuance: Reason
Most direct replacement for reason.
Boring
We stayed inside since it was raining.
Better
We stayed inside because it was raining.
Time (from then)
Nuance: Time
Good narrative time phrase.
Boring
I made one mistake, and since then I checked my work carefully.
Better
I made one mistake, and from then on I checked my work carefully.
Reason (changed situation)
Nuance: Changed situation
Use when the situation has changed.
Boring
We can relax since the test is over.
Better
We can relax now that the test is over.
Reason (explain thinking)
Nuance: Reasoned
Good for explaining reasoning.
Boring
We should focus on the main points since we have limited time.
Better
We should focus on the main points considering that we have limited time.
Time (formal-ish)
Nuance: Time
Clear time phrase.
Boring
Since then, he practiced every day.
Better
From that day on, he practiced every day.
Reason (logical)
Nuance: Logical
Logical tone; good for school writing.
Boring
We should start now since the deadline is tomorrow.
Better
We should start now given that the deadline is tomorrow.
Reason (noticing)
Nuance: Noticing
Somewhat informal; okay in narratives.
Boring
We waited outside since the room was crowded.
Better
We waited outside seeing that the room was crowded.
Time (formal)
Nuance: Time
Formal time phrase.
Boring
Since then, he practiced every day.
Better
From that point forward, he practiced every day.
Reason (formal, explains how)
Nuance: Explains
Formal; explains why/way.
Boring
The plan worked since everyone followed the rules.
Better
The plan worked in that everyone followed the rules.
Reason (very formal)
Nuance: Very formal
Very formal; use rarely.
Boring
The conclusion is strong since the evidence is clear.
Better
The conclusion is strong inasmuch as the evidence is clear.
Time (formal-ish)
Nuance: Time
Formal-ish; means until this moment.
Boring
Since then, we have studied every week.
Better
Up to now, we have studied every week.