I hit flat as a 2.5, 3.0, and for four years as a 3.5. I wanted to hit spin with Eastern, but it didn’t happen. I even hurt my wrist trying to hit topspin.
Then I changed my grip to SW. I bumped to 4.0 the next year.
The change gave me topspin for the first time, and I ran with it. I could dip a ball at an opponents feet; hit sharper angles to move them; and most devastating of all could hit topspin moonballs that jumped over their heads.
On the issue of whether learning spin is worth it, absolutely. For whatever reason, lower level women struggle with spin. Players used to tell me after matches that my ball jumped off the court. And being able to challenge your opponent’s overheads or their net hugging positioning with a topspin lob is money all day long.
If you’re not already using SW, you should know that you would need to commit to it and never look back. You will lose some matches. You can aid the transition by going out and drop feeding to see what different swing paths and contact points do.
Don’t forget to learn topspin with your 2hbh also.