To act on his advice seems the most sensible thing to do in this situation. I'm going to make an appointment with a solicitor. better phrased as: His advice seems very sensible to me...........
May I gently remind you that "seemed" in "To act on his advice seemed good" is not a "past participle." It is just the past tense of "seem." On the other hand, it is a p.p. in "To act on his advice had seemed a good idea at the time."
I was giving sentences to show the difference between using 'seems' (Present Tense) and 'seemed'. (Past Tense)
I considered explaining that difference was sufficient. I might myself have taken issue with the use of the infinitive 'to act' when the gerund is called for. But I was content to clarify the actual issue raised in the post.