I admit, it's difficult dropping Samus because I'm most familiar with her. I tried other character last night, and I just don't feel it. It's going to take time for me to learn to use Zamus if I decide to use her instead. Since I only have a month in with Samus, I think it's best to use someone else instead of wasting time.
I'll just leave you with this.
Using who you like > Using who is best
Trust me on this one. Regardless of how good the character is, if you enjoy another character more, you WILL learn a lot more, as not only will you be more enthusiastic to find new things out, but also enjoy the learning experience. If you don't enjoy the character, you most likely won't get very far (hence why ZeRo doesn't use Bayonetta for example; he just doesn't enjoy her playstyle).
Once upon a time, I used to consider Rosalina and Sheik my two characters. I have an unbreakable love for Rosalina, so the fact she's a good character is a huge bonus for me. However, while I "like" Sheik, I don't feel any real connection to the character. Marth is undoubtedly my true Smash character; my main in all games he's been in up to now, and I love him to bits. I never realy used him much in the beginning, because he wasn't as good as characters like Sheik. I made the decision to switch Sheik for Marth once more on the Wii U release, yet, despite him being clearly worse than Sheik, I just felt a whole lot better using him. I didn't feel like I was forcing myself into using a character, and I enjoyed the game a whole lot more. I have performed far better at tournaments using these two characters than I did using Rosalina and Sheik, if only because I feel more determined to win, and push myself, because I know the character, and love him.
I think this is part of the reason why I am absolutely a** with characters Olimar, Villager, and Dedede. I honestly have no connection to them, and can't bring myself to like them as fighters, or characters. Sure, I respect their existence, but I just can't connect with them.
My point is, don't force yourself to use a "more viable" character. Sure, if you think it will help you, go ahead. But trust your heart, and use who you enjoy most, and you'll most likely learn a whole lot more.
You also don't have to completely abandon characters. I almost strictly limit my tournament characters to Rosalina, Marth, and sometimes ZSS. However, I still play lots of characters I like. I merely focus on two or three for tournament.
Whatever your choice, I wish you luck. I picked ZSS up a month or so before her changes in 1.1.5, and haven't looked back since. I really like Samus as a character, so I feel pride in being at least somewhat threatening with them both.