Help With Compositon Structure

Hello. I am working on a composition and I want to start it with an A, B, A structure. The first A section is harmonically structured in four parts. The first part is I, vi, IV, V. The second part is I, vi, V, I. The third part is ii, V, I, IV. The fourth part is ii, V, IV, V. I want to create the B section now and have that section in two parts, both starting on the same chord and keeping relatively the same feel of the A section, but slightly less pronouced. The fourth part of the A section dictates, I should start the B section on I, or maybe iv, but neither sound right to me, and both are too strong. Does anyone have an opinion on what the structure for my B section should be? Thank you

Modulate. Every good bridge ever does that.

To elaborate on what Justin, Tokkemon, said:

The ternary form(ABA) is a rather simple form, and a good place to start for novice composers to explore in. However, there is a catch. The catch is: because of the its design, composers can forget to add interest, favor and variety to their pieces, and thus we have ABA that is repetitive piece that bores the listener thorough all three sections. Like what Justin said, modulate between each section; ensure those connections, the transitions, are smooth, prepared and resolved. Another thing you want might want to do is: score study baroque dances that are in this form. They are great way to learn what to do.

Thank you Tokkemon, Aniolel and Composer Phil for your responses. I have been trying to modulate, but it never sounded right to me, because I think Composer Phil was correct. I added a fifth section, after the dominant and I feel it has reopened the door on my composition. Thank you.