You asked for advice concerning whether you should study history or computer science at university. I will try making some suggestions.
You must keep in mind(记住) that, above all, your university training is a preparation for your future career. There is no doubt that(毫无疑问) the field of computer science offers far more job opportunities than history. We are now in a high-tech age(高科技时代). For the foreseeable future(可预知的未来), it would be necessary for everyone to be equipped with (配备)computer skills merely to earn a living.
Of course, I would recommend that you keep up your reading of history in your spare time.
You have asked me for some advice on how to improve…. I will try to give some useful suggestions.
I am writing to you to present what I think on the further improvement of … so as to…
I would like to make a recommendation that…
I am writing to advise you of…
I'd like to suggest that…
May I suggest that…
Could you please…
Why don't we…
In my opinion …
I feel that it would be beneficial if…
Thank you for your attention.
Please take good consideration of my advice. Thanks.
I trust you will take my suggestion into account.
I hope that my suggestions are helpful for your decision-making anyway.
I hope you will find these suggestions/ proposals/ recommendations(建议) helpful/ practical/ useful(有帮助的，实用的).