A letter giving advice

1) Greeting (1 paragraph)
Dear Margaret,

2) Opening Sentence (1 paragraph)
Having read your problem in…
I was sorry to read about your problem…
I understand how you are now and …
I was in the same situation you are a few years ago …

2. Main Body (2 paragraphs)
I think you should…
I strongly advise you to/not to…
You really should…
The best thing for you to do is…
If I were you, I’d…
It’s usually a good idea to…
In my experience, … works really well.

3. Conclusion (3 paragraphs)
1)To sum up,…/Summing up,…
To conclude,…/Concluding,…
Finally, I’m sure that if you follow my advice, you’ll see that everything will work out.
Good luck.
2)Yours faithfully,
Yours sincerely,
3) Name/Surname