Look don't listen to what anyone hear thinks. If you want it bid it if you don't than stay where you are. Just realize that as a junior reserve you are going to work hard and it will be frustrating as in future bids many will come in on top of you and it will take a while to hold a line. If you understand that and still want it go for it.
If you find out you made mistake and hate it you can down bid to 737 FO on any subsequent bid and be senior. Or you can wait two years and bid widebody FO and enjoy life.